Bump version num + Update requirements

BartyCrouch.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name           = 'BartyCrouch'
-  s.version        = '3.8.1'
+  s.version        = '3.9.0'
   s.summary        = 'Localization/I18n: Incrementally update your Strings files from .swift, .h, .m(m), .storyboard or .xib files and/or use machine-translation.'
   s.homepage       = 'https://github.com/Flinesoft/BartyCrouch'
   s.license        = { :type => 'MIT', :file => 'LICENSE.md' }

README.md

@@ -13,11 +13,11 @@
              alt="codebeat badge">
     </a>
     <a href="https://github.com/Flinesoft/BartyCrouch/releases">
-        <img src="https://img.shields.io/badge/Version-3.8.1-blue.svg"
-             alt="Version: 3.8.1">
+        <img src="https://img.shields.io/badge/Version-3.9.0-blue.svg"
+             alt="Version: 3.9.0">
     </a>
-    <img src="https://img.shields.io/badge/Swift-3-FFAC45.svg"
-         alt="Swift: 3">
+    <img src="https://img.shields.io/badge/Swift-4-FFAC45.svg"
+         alt="Swift: 4">
     <a href="https://github.com/Flinesoft/BartyCrouch/blob/stable/LICENSE.md">
         <img src="https://img.shields.io/badge/License-MIT-lightgrey.svg"
               alt="License: MIT">
@@ -41,7 +41,7 @@ BartyCrouch **incrementally updates** your Strings files from your Code *and* fr
 
 ## Requirements
 
-- Xcode 8 and Swift 3
+- Xcode 9 and Swift 4
 - Xcode Command Line Tools (see [here](http://stackoverflow.com/a/9329325/3451975) for installation instructions)
 
 ## Installation

Sources/Supporting Files/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>3.8.1</string>
+	<string>3.9.0</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>