Revert "update requires to be safe against some vulnerabilities"

This reverts commit 0b3d5b50ed.

Gemfile.lock

@@ -176,7 +176,7 @@ GEM
     html2haml (2.2.0)
       erubis (~> 2.7.0)
       haml (>= 4.0, < 6)
-      nokogiri (~> 1.8.1 )
+      nokogiri (>= 1.6.0)
       ruby_parser (~> 3.5)
     http-cookie (1.0.3)
       domain_name (~> 0.5)
@@ -284,7 +284,7 @@ GEM
       oauth2 (~> 1.0)
       omniauth (~> 1.2)
     orm_adapter (0.5.0)
-    paperclip (~> 5.2.0)
+    paperclip (5.1.0)
       activemodel (>= 4.2.0)
       activesupport (>= 4.2.0)
       cocaine (~> 0.5.5)
@@ -294,7 +294,7 @@ GEM
     polyamorous (1.3.1)
       activerecord (>= 3.0)
     public_suffix (2.0.5)
-    puma (2.16.0)
+    puma (3.9.1)
     pundit (1.1.0)
       activesupport (>= 3.0.0)
     pygments.rb (1.1.2)
@@ -305,7 +305,7 @@ GEM
       rack (~> 1.4)
     rack-mini-profiler (0.10.5)
       rack (>= 1.2.0)
-    rack-protection (~> 1.5.5)
+    rack-protection (1.5.3)
       rack
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -358,7 +358,7 @@ GEM
     redis-actionpack (5.0.1)
       actionpack (>= 4.0, < 6)
       redis-rack (>= 1, < 3)
-      redis-store (~> 1.4.0)
+      redis-store (>= 1.1.0, < 1.4.0)
     redis-activesupport (5.0.2)
       activesupport (>= 3, < 6)
       redis-store (~> 1.3.0)