v0.3.1 preparations. (#806)

RELEASE_PROCESS.md

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+## Making release of Kotlin/Native ##
+
+### Move version up in the repository ###
+
+   * Increment `konanVersion` in topmost `gradle.properties`.
+   * Create entry for new release in CHANGELOG.md file (consult git history for features included)
+   * Update RELEASE_NOTES.md with actual information on the released bits
+
+### Create tagged release branch ###
+
+    git checkout -b v0.X-fixes
+    git tag -a v0.X -m "version 0.X"
+    git push --set-upstream origin origin v0.X-fixes --tags
+
+### Build for all supported platforms ###
+
+Repeat those steps for Mac OS X, Linux x86-64 and Windows x64 machines/VMs:
+
+    git pull
+    git checkout -b v0.X-fixes origin/v0.X-fixes
+    ./gradlew clean bundle
+
+Make sure all samples are buildable from the bundle with both Gradle and shell script builds.
+
+### Create GitHub release ###
+
+ Create release at [`GitHub release page`](https://github.com/JetBrains/kotlin-native/releases).
+We usually mark 0.X releases as pre-releases.
+
+ Upload builds created on the previous step to the GitHub release page.
+
+
+### Upload builds ###
+
+ Upload build to CDN at upload.cds.intellij.net/kotlin/native.
+Bundles are available at http://download.jetbrains.com/kotlin/native/<build>
+in few minutes after upload.
+
+ Upload Gradle plugin to BinTray
+
+    BINTRAY_USER=... BINTRAY_KEY=... ./gradlew :tools:gradle-plugin:bintrayUpload
+
+### Blog post ###
+ 
+ Notify #kotlin-native channel on public slack.
+ 
+ Write a meaningfully sized blog post describing new release at https://blog.jetbrains.com.
+Login at https://blog.jetbrains.com/kotlin/wp-login.php. Synchronize with @abreslav and @yole.
+Publish and enjoy!
+