Update podspec with prerelease version 0.7.0-alpha.1+swift4

CryptoSwift.podspec

@@ -1,11 +1,11 @@
 Pod::Spec.new do |s|
   s.name         = "CryptoSwift"
-  s.version      = "0.6.9"
+  s.version      = "0.7.0-alpha.1+swift4"
+  s.source       = { :git => "https://github.com/krzyzanowskim/CryptoSwift.git", :tag => "#{s.version}" }
   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"
   s.license      = {:type => "Attribution License", :file => "LICENSE"}
-  s.source       = { :git => "https://github.com/krzyzanowskim/CryptoSwift.git", :tag => "#{s.version}" }
   s.authors      = {'Marcin Krzyżanowski' => 'marcin@krzyzanowskim.com'}
   s.social_media_url   = "https://twitter.com/krzyzanowskim"
   s.ios.deployment_target = "8.0"
@@ -13,6 +13,6 @@ Pod::Spec.new do |s|
   s.watchos.deployment_target = "2.0"
   s.tvos.deployment_target = "9.0"
   s.source_files  = "Sources/CryptoSwift/**/*.swift"
-  s.pod_target_xcconfig = { 'SWIFT_VERSION' => '4.0', 'SWIFT_OPTIMIZATION_LEVEL' => '-Owholemodule' }
   s.requires_arc = true
+  s.pod_target_xcconfig = { 'SWIFT_VERSION' => '4.0', 'SWIFT_OPTIMIZATION_LEVEL' => '-Owholemodule' }
 end

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-alpha.1</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>