prepare for release 3.1.2 with layout fixes

CHANGELOG.md

+## 3.1.2
+
+- [pr-1233](https://github.com/CosmicMind/Material/pull/1233): Fixed Layout breaks - subview ordering.
+  - [issue-1232](https://github.com/CosmicMind/Material/issues/1232): Layout breaks view arrangements.
+  
 ## 3.1.1
 
 - [pr-2131](https://github.com/CosmicMind/Material/pull/2131): Storyboard TextField fixes.

Material.podspec

 Pod::Spec.new do |s|
 	s.name = 'Material'
-	s.version = '3.1.1'
+	s.version = '3.1.2'
 	s.swift_version = '5.0'
 	s.license = 'BSD-3-Clause'
 	s.summary = 'A UI/UX framework for creating beautiful applications.'

Sources/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>3.1.1</string>
+	<string>3.1.2</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>