Update dependency webmock to v3.21.0

Gemfile

@@ -67,7 +67,7 @@ gem 'telepost', '>=0.3.1'
 gem 'thin', '1.8.2'
 gem 'total', '>=0.2.0'
 gem 'upwork-api', '1.3.5'
-gem 'webmock', '3.18.1', require: false
+gem 'webmock', '3.21.0', require: false
 gem 'xcop', '0.7.1'
 gem 'zache', '>=0.12.0'
 gem 'zold', '0.31.8'

Gemfile.lock

@@ -23,7 +23,7 @@ GEM
       minitest (>= 5.1)
       mutex_m
       tzinfo (~> 2.0)
-    addressable (2.8.5)
+    addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
     ansi (1.5.0)
     ast (2.4.2)
@@ -65,7 +65,8 @@ GEM
     coinbase (4.2.2)
     concurrent-ruby (1.2.2)
     connection_pool (2.4.1)
-    crack (0.4.5)
+    crack (0.4.6)
+      bigdecimal
       rexml
     daemons (1.4.1)
     descendants_tracker (0.0.4)
@@ -125,7 +126,7 @@ GEM
     haml (5.2.2)
       temple (>= 0.8.0)
       tilt
-    hashdiff (1.0.1)
+    hashdiff (1.1.0)
     hashie (5.0.0)
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
@@ -315,7 +316,7 @@ GEM
       axiom-types (~> 0.1)
       coercible (~> 1.0)
       descendants_tracker (~> 0.0, >= 0.0.3)
-    webmock (3.18.1)
+    webmock (3.21.0)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
@@ -407,7 +408,7 @@ DEPENDENCIES
   thin (= 1.8.2)
   total (>= 0.2.0)
   upwork-api (= 1.3.5)
-  webmock (= 3.18.1)
+  webmock (= 3.21.0)
   xcop (= 0.7.1)
   zache (>= 0.12.0)
   zold (= 0.31.8)