Update Ruby version and Gem dependencies (#46)

Author: mshafrir-stripe

.ruby-version

@@ -1 +1 @@
-2.5.0
+2.5.3

Gemfile

@@ -1,9 +1,9 @@
 source "https://rubygems.org"
 
-ruby "2.5.0"
+ruby "2.5.3"
 
-gem 'dotenv', '2.2.1'
+gem 'dotenv', '2.7.2'
 gem 'encrypted_cookie', '0.0.5'
-gem 'json', '2.1.0'
-gem 'sinatra', '2.0.2'
-gem 'stripe', '3.17.0'
+gem 'json', '2.2.0'
+gem 'sinatra', '2.0.5'
+gem 'stripe', '4.12.0'

Gemfile.lock

@@ -1,38 +1,42 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    dotenv (2.2.1)
+    connection_pool (2.2.2)
+    dotenv (2.7.2)
     encrypted_cookie (0.0.5)
       rack (>= 1.1, < 3)
-    faraday (0.15.3)
+    faraday (0.15.4)
       multipart-post (>= 1.2, < 3)
-    json (2.1.0)
+    json (2.2.0)
     multipart-post (2.0.0)
     mustermann (1.0.3)
-    rack (2.0.6)
-    rack-protection (2.0.2)
+    net-http-persistent (3.0.0)
+      connection_pool (~> 2.2)
+    rack (2.0.7)
+    rack-protection (2.0.5)
       rack
-    sinatra (2.0.2)
+    sinatra (2.0.5)
       mustermann (~> 1.0)
       rack (~> 2.0)
-      rack-protection (= 2.0.2)
+      rack-protection (= 2.0.5)
       tilt (~> 2.0)
-    stripe (3.17.0)
-      faraday (~> 0.10)
-    tilt (2.0.8)
+    stripe (4.12.0)
+      faraday (~> 0.13)
+      net-http-persistent (~> 3.0)
+    tilt (2.0.9)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  dotenv (= 2.2.1)
+  dotenv (= 2.7.2)
   encrypted_cookie (= 0.0.5)
-  json (= 2.1.0)
-  sinatra (= 2.0.2)
-  stripe (= 3.17.0)
+  json (= 2.2.0)
+  sinatra (= 2.0.5)
+  stripe (= 4.12.0)
 
 RUBY VERSION
-   ruby 2.5.0p0
+   ruby 2.5.3p105
 
 BUNDLED WITH
-   1.16.1
+   1.17.1

web.rb

@@ -118,7 +118,7 @@ def authenticate!
 end
 
 # This endpoint is used by the mobile example apps to create a PaymentIntent.
-# https://stripe.com/docs/api#create_payment_intent
+# https://stripe.com/docs/api/payment_intents/create
 # Just like the `/create_charge` endpoint, a real implementation would include controls
 # to prevent misuse
 post '/create_intent' do