change references to 'master' branch to 'main'

Author: emilykl

.github/ISSUE_TEMPLATE.md

@@ -2,6 +2,6 @@ Thanks for your interest in Plotly.py!
 
 Before opening an issue, please search for existing and closed issues :)
 
-**Please** accompany bug reports with a reproducible example. Please use the [latest version](https://github.com/plotly/plotly.py/blob/master/CHANGELOG.md) of plotly.py in your report unless not applicable.
+**Please** accompany bug reports with a reproducible example. Please use the [latest version](https://github.com/plotly/plotly.py/blob/main/CHANGELOG.md) of plotly.py in your report unless not applicable.
 
 Note that GitHub Issues are meant to be used for bug reports and feature requests only. Implementation or usage questions should be asked on [community.plotly.com](https://community.plotly.com/c/graphing-libraries/python/10) or on Stack Overflow (tagged [`plotly`](https://stackoverflow.com/questions/tagged/plotly)).

.github/pull_request_template.md

@@ -6,7 +6,7 @@ below :-).
 
 ### Documentation PR
 
-- [ ] I've [seen the `doc/README.md` file](https://github.com/plotly/plotly.py/blob/master/doc/README.md)
+- [ ] I've [seen the `doc/README.md` file](https://github.com/plotly/plotly.py/blob/main/doc/README.md)
 - [ ] This change runs in the current version of Plotly on PyPI and targets the `doc-prod` branch OR it targets the `main` branch
 - [ ] If this PR modifies the first example in a page or adds a new one, it is a `px` example if at all possible
 - [ ] Every new/modified example has a descriptive title and motivating sentence or paragraph
@@ -27,7 +27,7 @@ below :-).
 
 ## Code PR
 
-- [ ] I have read through the [contributing notes](https://github.com/plotly/plotly.py/blob/master/CONTRIBUTING.md) and understand the structure of the package. In particular, if my PR modifies code of `plotly.graph_objects`, my modifications concern the `codegen` files and not generated files.
+- [ ] I have read through the [contributing notes](https://github.com/plotly/plotly.py/blob/main/CONTRIBUTING.md) and understand the structure of the package. In particular, if my PR modifies code of `plotly.graph_objects`, my modifications concern the `codegen` files and not generated files.
 - [ ] I have added tests (if submitting a new feature or correcting a bug) or
   modified existing tests.
 - [ ] For a new feature, I have added documentation examples in an existing or

README.md

@@ -55,7 +55,7 @@ See the [Python documentation](https://plotly.com/python/) for more examples.
 
 Built on top of [plotly.js](https://github.com/plotly/plotly.js), `plotly.py` is a high-level, declarative charting library. plotly.js ships with over 30 chart types, including scientific charts, 3D graphs, statistical charts, SVG maps, financial charts, and more.
 
-`plotly.py` is [MIT Licensed](https://github.com/plotly/plotly.py/blob/master/LICENSE.txt). Plotly graphs can be viewed in Jupyter notebooks, standalone HTML files, or integrated into [Dash applications](https://dash.plotly.com/).
+`plotly.py` is [MIT Licensed](https://github.com/plotly/plotly.py/blob/main/LICENSE.txt). Plotly graphs can be viewed in Jupyter notebooks, standalone HTML files, or integrated into [Dash applications](https://dash.plotly.com/).
 
 [Contact us](https://plotly.com/consulting-and-oem/) for consulting, dashboard development, application integration, and feature additions.
 
@@ -67,9 +67,9 @@ Built on top of [plotly.js](https://github.com/plotly/plotly.js), `plotly.py` is
 ---
 
 - [Online Documentation](https://plotly.com/python/)
-- [Contributing to plotly](https://github.com/plotly/plotly.py/blob/master/CONTRIBUTING.md)
-- [Changelog](https://github.com/plotly/plotly.py/blob/master/CHANGELOG.md)
-- [Code of Conduct](https://github.com/plotly/plotly.py/blob/master/CODE_OF_CONDUCT.md)
+- [Contributing to plotly](https://github.com/plotly/plotly.py/blob/main/CONTRIBUTING.md)
+- [Changelog](https://github.com/plotly/plotly.py/blob/main/CHANGELOG.md)
+- [Code of Conduct](https://github.com/plotly/plotly.py/blob/main/CODE_OF_CONDUCT.md)
 - [Community forum](https://community.plotly.com)
 
 ---
@@ -147,7 +147,7 @@ conda install -c plotly plotly-geo=1.0.0
 
 Code and documentation copyright 2019 Plotly, Inc.
 
-Code released under the [MIT license](https://github.com/plotly/plotly.py/blob/master/LICENSE.txt).
+Code released under the [MIT license](https://github.com/plotly/plotly.py/blob/main/LICENSE.txt).
 
 Docs released under the [Creative Commons license](https://github.com/plotly/documentation/blob/source/LICENSE).
 

RELEASE.md

@@ -20,7 +20,7 @@ a link to the plotly.js CHANGELOG.
 
 ### Finalize versions
 
-**Create a branch `git checkout -b release-X.Y.Z` *from the tip of `origin/master`*.**
+**Create a branch `git checkout -b release-X.Y.Z` *from the tip of `origin/main`*.**
 
 Manually update the versions to `X.Y.Z` in the files specified below.