Update json-jwt gem to latest.

Gemfile.lock

@@ -30,38 +30,38 @@ GEM
       public_suffix (>= 2.0.2, < 5.0)
     aes_key_wrap (1.1.0)
     ast (2.4.2)
-    bindata (2.4.14)
+    bindata (2.4.15)
     binding_of_caller (1.0.0)
       debug_inspector (>= 0.0.1)
     builder (3.2.4)
     byebug (11.1.3)
     coderay (1.1.3)
-    concurrent-ruby (1.1.10)
+    concurrent-ruby (1.2.2)
     crack (0.4.5)
       rexml
     debug_inspector (1.1.0)
     diff-lcs (1.5.0)
-    faraday (2.7.2)
+    faraday (2.7.6)
       faraday-net_http (>= 2.0, < 3.1)
       ruby2_keywords (>= 0.0.4)
     faraday-follow_redirects (0.3.0)
       faraday (>= 1, < 3)
     faraday-net_http (3.0.2)
     fast_ignore (0.17.4)
     hashdiff (1.0.1)
-    i18n (1.12.0)
+    i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     interception (0.5)
     jaro_winkler (1.5.4)
     json (2.6.2)
-    json-jwt (1.16.1)
+    json-jwt (1.16.3)
       activesupport (>= 4.2)
       aes_key_wrap
       bindata
       faraday (~> 2.0)
       faraday-follow_redirects
     method_source (1.0.0)
-    minitest (5.17.0)
+    minitest (5.18.1)
     parallel (1.22.1)
     parser (3.1.2.1)
       ast (~> 2.4.1)
@@ -122,7 +122,7 @@ GEM
       jaro_winkler
       parallel (~> 1.0)
     to_bool (2.0.0)
-    tzinfo (2.0.5)
+    tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     unicode-display_width (2.3.0)
     webmock (3.18.0)
@@ -153,4 +153,4 @@ DEPENDENCIES
   webmock (>= 3.0)
 
 BUNDLED WITH
-   2.3.17
+   2.3.15