use python3 to test file-watch

projects/file-watch/test.sh

@@ -7,6 +7,12 @@ if [[ $(uname) == *"MINGW"* ]] || [ $TRAVIS_OS_NAME = "windows" ]; then
     expected=$'"hey" \r\n"hey" \r\n"hey"' 
 fi
 
+whichpy=python
+# "python" is supposed to mean Python3 everywhere now, but not in practice
+if [ ! -z "$(which python3)" ]; then
+    whichpy=python3
+fi
+
 haxe build.hxml && \
-timeout 0.35 python bin/main.py test-file.txt 0.1 "echo {} >> test-output.txt" 0  || \
+timeout 0.35 $whichpy bin/main.py test-file.txt 0.1 "echo {} >> test-output.txt" 0  || \
 if [[ "$(cat test-output.txt)" != *"$expected"* ]]; then exit 1; fi