Fix/check for stable release (#235)

Author: rodrigopavezi

scripts/check-release-type.sh

@@ -5,7 +5,7 @@ PACKAGE_VERSION="$(node -p -e "require('./package.json').version")"
 PACKAGE_NAME="$(node -p -e "require('./package.json').name")"
 
 # Check if current version exists in npm
-FOUND_VERSION=$(npm view $PACKAGE_NAME versions | grep $PACKAGE_VERSION)
+FOUND_VERSION=$(npm view $PACKAGE_NAME versions | grep "'$PACKAGE_VERSION'")
 
 if [ -z "$FOUND_VERSION" ]; then
     echo 'stable' # New version in package.json, do stable release