add python 3.4 detection

bin/compile

@@ -53,12 +53,14 @@ DEFAULT_PYTHON_VERSION="python-3.6.6"
 LATEST_36="python-3.6.6"
 LATEST_37="python-3.7.0"
 LATEST_35="python-3.5.6"
+LATEST_34="python-3.4.9"
 LATEST_2="python-2.7.15"
 
 # Supported Python Branches
 PY37="python-3.7"
 PY36="python-3.6"
 PY35="python-3.5"
+PY35="python-3.4"
 PY27="python-2.7"
 
 # Which stack is used (for binary downloading), if none is provided (e.g. outside of Heroku)?

bin/steps/python

@@ -32,6 +32,13 @@ if curl --output /dev/null --silent --head --fail "$VENDORED_PYTHON"; then
       echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
     fi
   fi
+  if [[ "$PYTHON_VERSION" == $PY34* ]]; then
+    # security update note
+    if [ "$PYTHON_VERSION" != "$LATEST_34" ]; then
+      puts-warn "$SECURITY_UPDATE" "$LATEST_34"
+      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
+    fi
+  fi
   if [[ "$PYTHON_VERSION" == $PY27* ]]; then
     # security update note
     if [ "$PYTHON_VERSION" != "$LATEST_27" ]; then