Add release script

Author: honnibal

bin/release.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+set -e
+
+# Insist repository is clean
+git diff-index --quiet HEAD
+
+version=$(grep "__version__ = " spacy/about.py)
+version=${version/__version__ = }
+version=${version/\'/}
+version=${version/\'/}
+version=${version/\"/}
+version=${version/\"/}
+
+echo "Pushing release-v"$version
+
+git tag -d release-v$version || true
+git push origin :release-v$version || true
+git tag release-v$version
+git push origin release-v$version