Add Chroma library for RGB<->HSV conversion in tests

test/remote/Gemfile

@@ -8,3 +8,4 @@ gem 'dotenv', '~> 2.6'
 gem 'multipart-post'
 gem 'net-ping'
 gem 'milight-easybulb', '~> 1.0'
+gem 'chroma', '~> 0.2.x'

test/remote/Gemfile.lock

@@ -1,6 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    chroma (0.2.0)
     diff-lcs (1.3)
     dotenv (2.6.0)
     milight-easybulb (1.0.0)
@@ -25,6 +26,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  chroma (~> 0.2.x)
   dotenv (~> 2.6)
   milight-easybulb (~> 1.0)
   mqtt (~> 0.5)