chore: update version to 3.1.1 and add changelog entry

- Update podspec version to 3.1.1
- Add changelog entry for exposing environment feature

Author: wendyliga

CHANGELOG.md

@@ -1,3 +1,6 @@
+# 3.1.1
+- expose environment
+
 # 3.1.0
 - use flatten section on search
 - add options to always show search bar

TPTweak.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |spec|
   spec.name             = "TPTweak"
-  spec.version          = "3.1.0"
+  spec.version          = "3.1.1"
   spec.summary          = "TPTweak is a debugging tool to help adjust your iOS app on the fly without recompile"
 
   spec.license          = { :type => "Apache 2.0", :file => "LICENSE.md" }