change check_url route to use query param instead of path

Gemfile.lock

@@ -1,10 +1,10 @@
 PATH
   remote: .
   specs:
-    prove_keybase (0.1.2)
-      active_model_serializers
-      faraday
-      faraday_middleware
+    prove_keybase (0.1.3)
+      active_model_serializers (~> 0.10)
+      faraday (~> 0.15)
+      faraday_middleware (~> 0.13)
 
 GEM
   remote: https://rubygems.org/
@@ -215,15 +215,15 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  bcrypt
+  bcrypt (~> 3.1)
   prove_keybase!
   pry
   rails (~> 5.2.3)
-  rspec-rails
+  rspec-rails (~> 3.8)
   rubocop
-  sqlite3
-  travis
-  webmock
+  sqlite3 (~> 1.4)
+  travis (~> 1.8)
+  webmock (~> 3.7)
 
 BUNDLED WITH
    1.17.2

config/routes.rb

@@ -1,5 +1,5 @@
 ProveKeybase::Engine.routes.draw do
   get 'config', to: 'config#show'
   resources :proofs, only: [:new, :create]
-  get 'api/v1/proofs/:username', to: 'api_v1_proofs#show', as: :check_proof
+  get 'api/v1/proofs', to: 'api_v1_proofs#show', as: :check_proof
 end

spec/controllers/config_controller_spec.rb

@@ -20,7 +20,7 @@
 
       config = JSON.parse(response.body)
       expect(config['profile_url']).to eq 'https://example.test/users/%{username}'
-      expect(config['check_url']).to eq "https://example.test/prove_keybase/api/v1/proofs/%{username}"
+      expect(config['check_url']).to eq "https://example.test/prove_keybase/api/v1/proofs?username=%{username}"
     end
   end
 end

spec/integration/proof_creation_spec.rb

@@ -60,7 +60,7 @@ def keybase_proof_live_response(request)
     # dumbed-down version of what keybase is actually doing
     # to determine whether or not a proof is "live"
     username = request.uri.query_values['username']
-    get "/prove_keybase/api/v1/proofs/#{username}"
+    get "/prove_keybase/api/v1/proofs?username=#{username}"
 
     local_api_response = JSON.parse(response.body)['signatures']
     proof_live = (local_api_response == [{ 'sig_hash' => token, 'kb_username' => kb_username }])