Update release notes for 0.1.21

Tadej Borovšak · Tadej Borovšak · commit b7a05a2d855e · 2018-05-17T10:59:07.000+02:00
Change-Id: Ie41971545dd8161317809c9eecf9d36beb572027
diff --git a/release-notes.txt b/release-notes.txt
@@ -1,3 +1,9 @@
+New in 0.1.21:
+
+* Update Apache Hadoop packages to latest stable upstream version.
+* Update poise cookbook dependencies that were failing with pip 10.
+* Add bypass for NPM certificate bug.
+
 New in 0.1.20:
 
 * Bump Apache Spark release to latest stable upstream version.
