dont include core in releases typo

Author: Krzysztof Wende

bump.sh

@@ -15,7 +15,7 @@ if git diff-index --quiet HEAD --; then
     git tag $VER
     git push origin master $VER
     rm -f elchemy-*.ez
-    rm -rf lib/Elmchemy/X*
+    rm -rf lib/Elchemy/X*
     mix archive.build
     mix archive.install "elchemy-$VER.ez" --force