prepare for release 3.1.0 (#413)

* prepare for release 3.1.0

* change release date

Author: jaeopt

.travis.yml

@@ -77,7 +77,7 @@ jobs:
       os: osx
       osx_image: xcode10
       env:
-        - VERSION=3.0.2
+        - VERSION=3.1.0
       install:
         # install hub
         - wget https://github.com/github/hub/releases/download/v2.11.2/hub-darwin-amd64-2.11.2.tgz -O /tmp/hub-darwin-amd64-2.11.2.tgz && tar -xvf /tmp/hub-darwin-amd64-2.11.2.tgz -C /usr/local/opt && ln -s /usr/local/opt/hub-darwin-amd64-2.11.2/bin/hub /usr/local/bin/hub
@@ -89,7 +89,7 @@ jobs:
       language: minimal
       os: osx
       env:
-        - VERSION=3.0.2
+        - VERSION=3.1.0
       install:
         # install hub
         - wget https://github.com/github/hub/releases/download/v2.11.2/hub-darwin-amd64-2.11.2.tgz -O /tmp/hub-darwin-amd64-2.11.2.tgz && tar -xvf /tmp/hub-darwin-amd64-2.11.2.tgz -C /usr/local/opt && ln -s /usr/local/opt/hub-darwin-amd64-2.11.2/bin/hub /usr/local/bin/hub

CHANGELOG.md

@@ -1,5 +1,20 @@
 # Optimizely Objective-C SDK Changelog
 
+## 3.1.0
+May 16th, 2019
+
+## New Features:
+* Introduced Decision notification listener to be able to record:
+* Variation assignments for users activated in an experiment.
+* Feature access for users.
+* Feature variable value for users.
+
+## Bug Fixes:
+* Feature variable APIs return default variable value when featureEnabled property is false. ([#390](https://github.com/optimizely/objective-c-sdk/pull/390))
+
+## Deprecated
+* Activate notification listener is deprecated as of this release. Recommendation is to use the new Decision notification listener. Activate notification listener will be removed in the next major release.
+
 ## 3.0.2
 February 27th, 2019