prep for 2.2.0 release (#220)

+ update CHANGELOG
+ bump base node version to 10.21.0
diff --git a/CHANGELOG.md b/CHANGELOG.md
index da7a5b7..50be0b0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,13 @@
 
 # Changelog
 
+## 2.2.0
+* NodeJS version: 10.21.0
+* Handle URL params gently (#219)
+* Add missing npm install. (#218)
+* Fix can't update strict (#217)
+* Make get the strict value correctly when using wsk trigger to get (#216)
+
 ## 2.1.0
 
 * NodeJS version: 10.20.1
diff --git a/Dockerfile b/Dockerfile
index 6ae46f2..ad24213 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,7 +15,7 @@
 # limitations under the License.
 #
 
-FROM node:10.20.1
+FROM node:10.21.0
 
 # only package.json
 ADD package.json /