Add back a py3.7 run on windows

.travis.yml

@@ -13,6 +13,15 @@ matrix:
               - export PATH="/c/Python:/c/Python/Scripts:$PATH"
               - python -m pip install --upgrade pip wheel
 
+        - name: "Windows, Python 3.7"
+          os: windows
+          python: 3.7  # only works on linux
+          language: sh
+          before_install:
+              - choco install python3 --version 3.7.4 --params "/InstallDir:C:\\Python"
+              - export PATH="/c/Python:/c/Python/Scripts:$PATH"
+              - python -m pip install --upgrade pip wheel
+
         - python: 3.7  # this works for Linux but is ignored on macOS or Windows
         - python: 3.8
 

README.rst

@@ -737,7 +737,7 @@ See `#61`_ and `#79`_ for further details.
 
 .. _freeze_support(): https://docs.python.org/3/library/multiprocessing.html#multiprocessing.freeze_support
 .. _#61: https://github.com/goodboy/tractor/pull/61#issuecomment-470053512
-.. _#79: https://github.com/goodboy/tractor/pull/79#issuecomment-470053512
+.. _#79: https://github.com/goodboy/tractor/pull/79
 
 
 Enabling logging