bump release

small tweak to fix test

src/biplane/diff.cr

@@ -79,7 +79,7 @@ module Biplane
     private def format_at_indent(string : String, ui : Hash, indent_level : Int32)
       indents = Array.new(indent_level, "  ").join("")
       formatted = (ui[:symbol] as String) + indents + string
-      formatted = formatted.colorize(ui[:color] as Symbol) if $COLORIZE
+      formatted = formatted.colorize(ui[:color] as Symbol).to_s if $COLORIZE
 
       formatted
     end

src/biplane/printer/nested_diff.cr

@@ -52,7 +52,7 @@ module Biplane::Printer
       indents = Array.new(indent_level, "  ").join("")
 
       text = (prefix + indents + string)
-      text = text.colorize(color) if color && $COLORIZE
+      text = text.colorize(color).to_s if color && $COLORIZE
 
       puts text
     end

src/biplane/version.cr

@@ -1,3 +1,3 @@
 module Biplane
-  VERSION = "1.1.4"
+  VERSION = "1.1.5"
 end