Update release notes for v1.6.1-183-203 (#243)

* Update org.jetbrains.intellij dep to 0.4.20 to have Gradle 5.1-5.3
    produce correctly-named plugin distribution archives

Co-authored-by: Alexander Pavlov <apavlov@google.com>

Author: crdev

build.gradle

@@ -6,7 +6,7 @@ buildscript {
 
 plugins {
     id 'org.jetbrains.grammarkit' version '2019.2'
-    id 'org.jetbrains.intellij' version '0.4.15'
+    id 'org.jetbrains.intellij' version '0.4.20'
     id 'org.jetbrains.kotlin.jvm' version '1.3.61'
     id 'org.kordamp.gradle.markdown' version '2.0.0'
 }

releasenotes.md

@@ -1,12 +1,24 @@
 # Release notes
 
+## Release notes for 1.6.1-183-203
+
+### General
+ * Starting with 1.6.1, Bamboo Soy releases will be IntelliJ API version-dependent
+
+### Features
+ * Added support for index syntax in {for} (fixes #228)
+
+### Bug and stability fixes
+ * Fixed parsing of the "import" string inside HTML (fixes #231)
+
+
 ## Release notes for 1.6
 
 ### Features
  * Added support for list comprehensions (fixed #195)
  * Added proto initialization support (fixes #201)
  * Added support for the {css} and {xid} functional style syntax, {nbsp}, {velog}
- * Added support for {skip}, {key} (fixes #205) 
+ * Added support for {skip}, {key} (fixes #205)
  * Added support for {ifempty} inside {for}
  * Added support for the "import" syntax (fixes #222)
  * Added support for the methods syntax
@@ -68,7 +80,7 @@
  * Autocompletion:
    * Add support for `stricthtml="true"` in template definition blocks.
    * Better context detection for where variable autocompletion should trigger.
- 
+
 ### Stability and bug fixes
  * Fixed various NPEs and bugs that occurred on partial/incomplete code constructs.