Removed the force unwrap in the FailableIterator extension for the next () method

Although the method accepts an optional return, the function forces unwrap

Author: Denis

SQLite.xcodeproj/project.pbxproj

@@ -1257,6 +1257,7 @@
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
+				MARKETING_VERSION = 0.12.3;
 				PRODUCT_BUNDLE_IDENTIFIER = com.stephencelis.SQLite;
 				PRODUCT_NAME = SQLite;
 				SKIP_INSTALL = YES;
@@ -1278,6 +1279,7 @@
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
+				MARKETING_VERSION = 0.12.3;
 				PRODUCT_BUNDLE_IDENTIFIER = com.stephencelis.SQLite;
 				PRODUCT_NAME = SQLite;
 				SKIP_INSTALL = YES;

Sources/SQLite/Core/Statement.swift

@@ -208,7 +208,7 @@ public protocol FailableIterator : IteratorProtocol {
 
 extension FailableIterator {
     public func next() -> Element? {
-        return try! failableNext()
+        return try? failableNext()
     }
 }
 

Sources/SQLite/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>0.12.2</string>
+	<string>$(MARKETING_VERSION)</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>