Added monkey patch to support rubies < 2.5

Gemfile.lock

@@ -1,13 +1,10 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    chunky_png (1.3.10)
-    glu (8.2.2)
-    glu (8.2.2-x86-mingw32)
+    glu (8.3.0)
+    glu (8.3.0-x86-mingw32)
     gosu (0.13.3)
     gosu (0.13.3-x86-mingw32)
-    oily_png (1.2.1)
-      chunky_png (~> 1.3.7)
     opengl-bindings (1.6.6)
 
 PLATFORMS
@@ -17,8 +14,7 @@ PLATFORMS
 DEPENDENCIES
   glu
   gosu
-  oily_png
   opengl-bindings
 
 BUNDLED WITH
-   1.16.1
+   1.16.2

i-mic-fps.rb

@@ -20,6 +20,25 @@ end
 
 BoundingBox = Struct.new(:min_x, :min_y, :min_z, :max_x, :max_y, :max_z)
 
+if RUBY_VERSION < "2.5.0"
+  puts "-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-"
+  puts "|NOTICE| Ruby is #{RUBY_VERSION} not 2.5.0+..............................|Notice|"
+  puts "|NOTICE| Monkey Patching Float to add required '.clamp' method.|Notice|"
+  puts "-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-"
+  puts
+  class Float
+    def clamp(min, max)
+      if self < min
+        min
+      elsif self > max
+        max
+      else
+        return self
+      end
+    end
+  end
+end
+
 $debug = ARGV.join.include?("--debug") ? true : false
 
 require_relative "lib/common_methods"