Add update_version.sh

tools/update_version.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+new_version=$1
+
+current_version=`grep -oP "(?<=VERSION \= \")([0-9.]+)(?=\")" cloudinary-core/src/main/java/com/cloudinary/Cloudinary.java`
+current_version_re=${current_version//./\\.}
+echo "Current version is $current_version"
+if [ -n "$new_version" ]; then
+    echo "New version will be $new_version"
+    echo "Pattern used: $current_version_re"
+    sed -e "s/${current_version_re}/${new_version}/g" -i "" cloudinary-core/src/main/java/com/cloudinary/Cloudinary.java
+    sed -e "s/${current_version_re}/${new_version}/g" -i "" README.md
+    sed -e "s/${current_version_re}/${new_version}/g" -i "" gradle.properties
+    git changelog -t $new_version
+else
+    echo "Usage: $0 <new version>"
+    echo "For example: $0 1.9.2"
+fi