Added StringLiteral#chomp in macros

spec/compiler/macro/macro_expander_spec.cr

@@ -278,6 +278,10 @@ describe "MacroExpander" do
     it "executes string [Range] exclusive" do
       assert_macro "", %({{"hello"[1...-2]}}), [] of ASTNode, %("el")
     end
+
+    it "executes string chomp" do
+      assert_macro "", %({{"hello\n".chomp}}), [] of ASTNode, %("hello")
+    end
   end
 
   describe "array methods" do

src/compiler/crystal/macros.cr

@@ -729,6 +729,8 @@ module Crystal
         end
       when "capitalize"
         interpret_argless_method(method, args) { StringLiteral.new(@value.capitalize) }
+      when "chomp"
+        interpret_argless_method(method, args) { StringLiteral.new(@value.chomp) }
       when "downcase"
         interpret_argless_method(method, args) { StringLiteral.new(@value.downcase) }
       when "empty?"