[Controller Tests] Adds Missing HTTP Verbs (#11)

Issue: #10

Garnet should supports all the HTTP verbs available for simulating
requests in a conntroller test. Currently is missing the Options, Trace,
and Connect http verbs

Adds missing HTTP Read Verbs to generate helper methods for
testing controllers.

With these changes Garnet has available all the HTTP verbs needed.

src/garnet_spec/controller/test.cr

@@ -3,7 +3,7 @@ require "http/server"
 module GarnetSpec::Controller
   abstract class Test
     macro inherited
-        {% http_read_verbs = %w(get head) %}
+        {% http_read_verbs = %w(get head options trace connect) %}
         {% http_write_verbs = %w(post put patch delete) %}
         {% http_verbs = http_read_verbs + http_write_verbs %}