Be clearer in our warnings about which Py3 we mean

Author: sigmavirus24

bin/steps/python

@@ -15,12 +15,12 @@ if [[ $PYTHON_VERSION =~ ^python-2 ]]; then
   fi
 else
   if [[ $PYTHON_VERSION =~ ^python-3.7 ]] && [[ "$PYTHON_VERSION" != "$LATEST_37" ]]; then
-    puts-warn "The latest version of Python 3 is $LATEST_37 (you are using $PYTHON_VERSION, which is unsupported)."
+    puts-warn "The latest version of Python 3.7 is $LATEST_37 (you are using $PYTHON_VERSION, which is unsupported)."
     puts-warn "We recommend upgrading by specifying the latest version ($LATEST_37)."
     echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
   else
     if [[ "$PYTHON_VERSION" != "$LATEST_36" ]]; then
-      puts-warn "The latest version of Python 3 is $LATEST_36 (you are using $PYTHON_VERSION, which is unsupported)."
+      puts-warn "The latest version of Python 3.6 is $LATEST_36 (you are using $PYTHON_VERSION, which is unsupported)."
       puts-warn "We recommend upgrading by specifying the latest version ($LATEST_36)."
       echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
     fi