Trailing space to make swift-format happy

Author: natikgadzhi

Sources/SwiftParser/Parser.swift

@@ -88,7 +88,7 @@
 /// operates on a copy of the lexical stream, no input tokens are lost..
 public struct Parser {
   var arena: ParsingSyntaxArena
-  
+
   /// A view of the sequence of lexemes in the input.
   var lexemes: Lexer.LexemeSequence