Bump secure_headers

Gemfile

@@ -152,7 +152,7 @@ gem "string-direction", "1.2.1"
 
 # Security Headers
 
-gem "secure_headers", "5.0.5"
+gem "secure_headers", "6.0.0"
 
 # Services
 

Gemfile.lock

@@ -642,8 +642,7 @@ GEM
     scss_lint (0.55.0)
       rake (>= 0.9, < 13)
       sass (~> 3.4.20)
-    secure_headers (5.0.5)
-      useragent (>= 0.15.0)
+    secure_headers (6.0.0)
     shellany (0.0.1)
     shoulda-matchers (3.1.2)
       activesupport (>= 4.0.0)
@@ -728,7 +727,6 @@ GEM
     unicorn-worker-killer (0.4.4)
       get_process_mem (~> 0)
       unicorn (>= 4, < 6)
-    useragent (0.16.10)
     uuid (2.3.9)
       macaddr (~> 1.0)
     valid (1.2.0)
@@ -879,7 +877,7 @@ DEPENDENCIES
   ruby-oembed (= 0.12.0)
   rubyzip (= 1.2.2)
   sass-rails (= 5.0.7)
-  secure_headers (= 5.0.5)
+  secure_headers (= 6.0.0)
   shoulda-matchers (= 3.1.2)
   sidekiq (= 5.2.3)
   sidekiq-cron (= 1.0.4)