add new bash script for release version update

bin/utils/release_version_update.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+#
+# usage: ./bin/utils/release_version_update.sh 3.0.1-SNAPSHOT 3.0.1
+#
+# Copyright 2018 OpenAPI-Generator Contributors (https://openapi-generator.tech)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+if [[ "$1" != "" ]]; then
+    FROM="$1"
+else
+    echo "Missing argument. Usage e.g.: ./bin/utils/release_version_update.sh 3.0.1-SNAPSHOT 3.0.1"
+    exit 1;
+fi
+
+if [[ "$2" != "" ]]; then
+    TO="$2"
+else
+    echo "Missing argument. Usage e.g.: ./bin/utils/release_version_update.sh 3.0.1-SNAPSHOT 3.0.1"
+    exit 1;
+fi
+
+
+echo "IMPORTANT: this script works on Mac only"
+echo "Release preparation: replacing $FROM with $TO in different files"
+
+declare -a files=("CI/pom.xml.bash"
+                  "CI/pom.xml.circleci"
+                  "CI/pom.xml.circleci.java7"
+                  "CI/pom.xml.ios"
+                  "modules/openapi-generator-cli/pom.xml"
+                  "modules/openapi-generator-gradle-plugin/README.adoc"
+                  "modules/openapi-generator-gradle-plugin/gradle.properties"
+                  "modules/openapi-generator-gradle-plugin/pom.xml"
+                  "modules/openapi-generator-gradle-plugin/samples/local-spec/build.gradle"
+                  "modules/openapi-generator-maven-plugin/pom.xml"
+                  "modules/openapi-generator-online/pom.xml"
+                  "modules/openapi-generator/pom.xml"
+                  "modules/openapi-generator-online/Dockerfile"
+                  "pom.xml"
+                  "README.md")
+
+for filename in "${files[@]}"; do
+  # e.g. sed -i '' "s/3.0.1-SNAPSHOT/3.0.1/g" CI/pom.xml.bash
+  #echo "Running command: sed -i '' "s/$FROM/$TO/g" $filename"
+  if sed -i '' "s/$FROM/$TO/g" $filename; then
+    echo "Updated $filename successfully!"
+  else
+    echo "ERROR: Failed to update $filename with the following command"
+    echo "sed -i '' \"s/$FROM/$TO/g\" $filename"
+  fi
+done