Merge pull request #393 from ydah/omit-long-output

Omit too long text when printing module `Lrama::Lexer::GrammarFile` class

lib/lrama/lexer/grammar_file.rb

@@ -14,6 +14,10 @@ def initialize(path, text)
         @text = Text.new(text).freeze
       end
 
+      def inspect
+        "<#{self.class}: @path=#{path}, @text=#{text.inspect}>"
+      end
+
       def ==(other)
         self.class == other.class &&
         self.path == other.path