Bumped version to 5.0.0-beta4

SDWebImage.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name = 'SDWebImage'
-  s.version = '5.0.0-beta3'
+  s.version = '5.0.0-beta4'
 
   s.osx.deployment_target = '10.10'
   s.ios.deployment_target = '8.0'

WebImage/Info.plist

@@ -15,11 +15,11 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>5.0.0-beta3</string>
+	<string>5.0.0-beta4</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>5.0.0-beta3</string>
+	<string>5.0.0-beta4</string>
 	<key>NSPrincipalClass</key>
 	<string></string>
 </dict>