chore: do windows stuff conditionally

Author: achingbrain

.travis.yml

@@ -13,11 +13,12 @@ os:
   - linux
   - osx
   - windows
-    before_install:
-      - which git
-      - git --version
-      - ls -l /c/PROGRA~1/Git/mingw64/libexec/git-core
-      - export PATH=/c/PROGRA~1/Git/usr/bin:/c/PROGRA~1/Git/mingw64/libexec/git-core:$PATH
+
+before_install:
+  - if [ "$TRAVIS_OS_NAME" = "windows" ]; which git ; fi
+  - if [ "$TRAVIS_OS_NAME" = "windows" ]; git --version ; fi
+  - if [ "$TRAVIS_OS_NAME" = "windows" ]; ls -l /c/PROGRA~1/Git/mingw64/libexec/git-core ; fi
+  - if [ "$TRAVIS_OS_NAME" = "windows" ]; export PATH=/c/PROGRA~1/Git/usr/bin:/c/PROGRA~1/Git/mingw64/libexec/git-core:$PATH ; fi
 
 script: npx nyc -s npm run test:node -- --bail
 after_success: npx nyc report --reporter=text-lcov > coverage.lcov && npx codecov