Bump PyPy version in Travis CI to the latest 7.1.1

[webknjaz]

No description provided.

[webknjaz]

(it's related to the changes during recent months and is probably undocumented)

[codecov-io]

Codecov Report

Merging #83 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #83   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          20     20           
  Lines         927    927           
  Branches      173    173           
=====================================
  Hits          927    927

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[webknjaz]

https://travis-ci.org/python-hyper/h11/jobs/536772672#L186

$ python --version
Python 3.6.1 (784b254d6699, Apr 14 2019, 10:22:42)
[PyPy 7.1.1-beta0 with GCC 6.2.0 20160901]

https://travis-ci.org/python-hyper/h11/jobs/536772671#L186

$ python --version
Python 2.7.13 (8cdda8b8cdb8, Apr 14 2019, 14:06:44)
[PyPy 7.1.1 with GCC 6.2.0 20160901]

[njsmith]

Thanks!