super minor tweak to README & warning emit in generate

Changelog.md

@@ -21,6 +21,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Changed README to clarify use of `swift-doc` vs. `swift doc`
   on the command line.
   #89 by @mattt.
+- Changed the `generate` command to emit a warning if no source
+  files are found.
+  #92 by @heckj
 
 ### Fixed
 
@@ -30,6 +33,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   #62 by @victor-pavlychko.
 - Fixed rendering of protocol requirements in the HTML version.
   #76 by @victor-pavlychko.
+- Fixed default location of sources reference in README
+  #92 by @heckj
 
 ## [1.0.0-beta.2] - 2020-04-08
 

README.md

@@ -238,7 +238,7 @@ jobs:
       - name: Generate Documentation
         uses: SwiftDocOrg/swift-doc@master
         with:
-          inputs: "Source"
+          inputs: "Sources"
           module-name: MyLibrary
           output: "Documentation"
       - name: Upload Documentation to Wiki

Sources/swift-doc/Subcommands/Generate.swift

@@ -72,7 +72,10 @@ extension SwiftDoc {
           pages[path(for: name)] = GlobalPage(module: module, name: name, symbols: symbols)
         }
 
-        guard !pages.isEmpty else { return }
+        guard !pages.isEmpty else {
+            logger.warning("No public API symbols were found at the specified path. No output was written.")
+            return
+        }
 
         if pages.count == 1, let page = pages.first?.value {
           let filename: String