bundle update for security reasons

Gemfile.lock

@@ -1,33 +1,33 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    backports (3.8.0)
-    multi_json (1.12.2)
-    mustermann (1.0.1)
-    power_assert (1.1.0)
-    puma (3.10.0)
-    rack (2.0.3)
-    rack-protection (2.0.0)
+    backports (3.11.1)
+    multi_json (1.13.1)
+    mustermann (1.0.2)
+    power_assert (1.1.1)
+    puma (3.11.3)
+    rack (2.0.4)
+    rack-protection (2.0.1)
       rack
-    rack-test (0.7.0)
+    rack-test (0.8.3)
       rack (>= 1.0, < 3)
-    rake (12.1.0)
-    sinatra (2.0.0)
+    rake (12.3.1)
+    sinatra (2.0.1)
       mustermann (~> 1.0)
       rack (~> 2.0)
-      rack-protection (= 2.0.0)
+      rack-protection (= 2.0.1)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.0)
+    sinatra-contrib (2.0.1)
       backports (>= 2.0)
       multi_json
       mustermann (~> 1.0)
-      rack-protection (= 2.0.0)
-      sinatra (= 2.0.0)
+      rack-protection (= 2.0.1)
+      sinatra (= 2.0.1)
       tilt (>= 1.3, < 3)
     sinatra-jsonp (0.5.0)
       multi_json (~> 1.8)
       sinatra (>= 1.0)
-    test-unit (3.2.6)
+    test-unit (3.2.7)
       power_assert
     tilt (2.0.8)
 
@@ -44,4 +44,4 @@ DEPENDENCIES
   test-unit
 
 BUNDLED WITH
-   1.15.3
+   1.16.1