Release checklist added

Author: SokolovaMaria

RELEASE.md

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+# kotlinx.atomicfu release checklist
+
+To release new `<version>` of `kotlinx-atomicfu`:
+
+1. Checkout `develop` branch: <br> 
+   `git checkout develop`
+
+2. Retrieve the most recent `develop`: <br> 
+   `git pull`
+   
+3. Make sure the `master` branch is fully merged into `develop`:
+   `git merge origin/master`   
+
+4. Search & replace `<old-version>` with `<version>` across the project files. Should replace in:
+   * [`README.md`](README.md)
+   * [`gradle.properties`](gradle.properties)    
+   * Make sure to **exclude** `CHANGES.md` from replacements.
+   
+   As an alternative approach you can use `./bump-version.sh old_version new_version`
+  
+5. Write release notes in [`CHANGES.md`](CHANGES.md):
+   * Use old releases as example of style.
+   * Write each change on a single line (don't wrap with CR).
+   * Study commit message from previous release.
+
+6. Create branch for this release:
+   `git checkout -b version-<version>`
+
+7. Commit updated files to a new version branch:<br>
+   `git commit -a -m "Version <version>"`
+   
+8. Push new version into the branch:<br>
+   `git push -u origin version-<version>`
+   
+9. Create Pull-Request on GitHub from `version-<version>` branch into `master`:
+   * Review it.
+   * Make sure it build on CI.
+   * Get approval for it.
+   
+10. Merge new version branch into `master`:<br>
+   `git checkout master`<br>
+   `git merge version-<version>`<br>
+   `git push`   
+
+11. On [TeamCity integration server](https://teamcity.jetbrains.com/project.html?projectId=KotlinTools_KotlinxAtomicfu): 
+    * Wait until "Build" configuration for committed `master` branch passes tests.
+    * Run "Deploy (Configure, RUN THIS ONE)" configuration with the corresponding new version.
+
+12. In [GitHub](https://github.com/Kotlin/kotlinx.atomicfu) interface:
+    * Create a release named `<version>`. 
+    * Cut & paste lines from [`CHANGES.md`](CHANGES.md) into description.
+   
+13. In [Bintray](https://bintray.com/kotlin/kotlinx/kotlinx.atomicfu#) admin interface:
+    * Publish artifacts of the new version.
+    * Wait until newly published version becomes the most recent.
+    * Sync to Maven Central.
+
+14. Switch into `develop` branch:<br>
+   `git checkout develop`
+ 
+15. Fetch the latest `master`:<br>
+   `git fetch` 
+   
+16. Merge release from `master`:<br>
+   `git merge origin/master`
+   
+17. Push updates to `develop`:<br>
+   `git push`

bump-version.sh

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+#!/bin/bash
+
+if [ "$#" -ne 2 ]
+  then
+    echo "Use: ./bump-version old_version new_version"
+    exit
+fi
+
+old_version=$1
+new_version=$2
+
+update_version() {
+    echo "Updating version from '$old_version' to '$new_version' in $1"
+    sed -i.bak s/$old_version/$new_version/g $1
+    rm $1.bak
+}
+
+update_version "README.md"
+update_version "gradle.properties"
+
+# Escape dots, e.g. 1.0.0 -> 1\.0\.0
+escaped_old_version=$(echo $old_version | sed s/[.]/\\\\./g)
+result=$(find ./ -type f \( -iname \*.properties -o -iname \*.md \) | grep -v "\.gradle" | grep -v "build" | xargs -I{} grep -H "$escaped_old_version" {} | grep -v CHANGES.md)
+if [ -z "$result" ];
+then
+    echo "Done"
+else
+    echo "ERROR: Previous version is present in the project: $result"
+    exit -1
+fi