Resolved the warning that was raised because "characters" of a "String" has been deprecated.

Vinay Ganesh · Vinay Ganesh · commit 5dceef202899 · 2017-11-06T22:10:46.000-08:00
diff --git a/Sources/SQLite/Helpers.swift b/Sources/SQLite/Helpers.swift
@@ -56,7 +56,7 @@ let SQLITE_TRANSIENT = unsafeBitCast(-1, to: sqlite3_destructor_type.self)
 extension String {
 
     func quote(_ mark: Character = "\"") -> String {
-        let escaped = characters.reduce("") { string, character in
+        let escaped = reduce("") { string, character in
             string + (character == mark ? "\(mark)\(mark)" : "\(character)")
         }
         return "\(mark)\(escaped)\(mark)"

Original file line number	Diff line number	Diff line change
`@@ -56,7 +56,7 @@ let SQLITE_TRANSIENT = unsafeBitCast(-1, to: sqlite3_destructor_type.self)`
`56`	`56`	`extension String {`
`57`	`57`
`58`	`58`	`func quote(_ mark: Character = "\"") -> String {`
`59`		`- let escaped = characters.reduce("") { string, character in`
	`59`	`+ let escaped = reduce("") { string, character in`
`60`	`60`	`string + (character == mark ? "\(mark)\(mark)" : "\(character)")`
`61`	`61`	`}`
`62`	`62`	`return "\(mark)\(escaped)\(mark)"`