fixup! lib: accept Python 3 by default

.travis.yml

@@ -70,6 +70,7 @@ before_script:
   # exit-zero treats all errors as warnings.  Two space indentation is OK.  The GitHub editor is 127 chars wide
   - flake8 . --count --exit-zero --ignore=E111,E114,W503 --max-complexity=10 --max-line-length=127 --statistics
   - npm install
+  - npm install minizlib  # https://github.com/isaacs/minizlib/issues/9
   - npm list
 script:
   - node -e 'require("npmlog").level="verbose"; require("./lib/find-python")(null,()=>{})'