Update README section about versions. Bump to 0.7.0-alpha.1.

Author: krzyzanowskim

CryptoSwift.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "CryptoSwift"
-  s.version      = "0.6.9"
+  s.version      = "0.7.0-alpha.1"
   s.summary      = "Cryptography in Swift. SHA, MD5, CRC, PBKDF, Poly1305, HMAC, ChaCha20, Rabbit, Blowfish, AES."
   s.description  = "Cryptography functions and helpers for Swift implemented in Swift. SHA, MD5, PBKDF1, PBKDF2, CRC, Poly1305, HMAC, ChaCha20, Rabbit, Blowfish, AES."
   s.homepage     = "https://github.com/krzyzanowskim/CryptoSwift"

README.md

@@ -109,9 +109,9 @@ In the project, you'll find [single scheme](http://promisekit.org/news/2016/08/M
 - Swift 1.2: branch [swift12](https://github.com/krzyzanowskim/CryptoSwift/tree/swift12) version <= 0.0.13
 - Swift 2.1: branch [swift21](https://github.com/krzyzanowskim/CryptoSwift/tree/swift21) version <= 0.2.3
 - Swift 2.2, 2.3: branch [swift2](https://github.com/krzyzanowskim/CryptoSwift/tree/swift2) version <= 0.5.2
-- Swift 3.1, branch [master](https://github.com/krzyzanowskim/CryptoSwift/tree/master)
-- Swift 3.2, branch [develop](https://github.com/krzyzanowskim/CryptoSwift/tree/develop)
-- Swift 4.0, branch [swift4](https://github.com/krzyzanowskim/CryptoSwift/tree/swift4)
+- Swift 3.1, branch [master](https://github.com/krzyzanowskim/CryptoSwift/tree/master) version <= 0.6.9
+- Swift 3.2, branch [develop](https://github.com/krzyzanowskim/CryptoSwift/tree/develop) version <= 0.7.0
+- Swift 4.0, branch [swift4](https://github.com/krzyzanowskim/CryptoSwift/tree/swift4) version <= 0.7.1
 
 #### CocoaPods
 

Sources/CryptoSwift/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>0.6.9</string>
+	<string>0.7.0</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>