Mark compatible with Rails 5.2

Gemfile.lock

@@ -1,29 +1,29 @@
 PATH
   remote: .
   specs:
-    psenv (0.2.1)
+    psenv (0.3.0)
       aws-sdk-ssm (~> 1)
-    psenv-rails (0.2.1)
-      psenv (= 0.2.1)
-      railties (>= 3.2, < 5.2)
+    psenv-rails (0.3.0)
+      psenv (= 0.3.0)
+      railties (>= 3.2, < 5.3)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    actionpack (5.1.6)
-      actionview (= 5.1.6)
-      activesupport (= 5.1.6)
+    actionpack (5.2.0)
+      actionview (= 5.2.0)
+      activesupport (= 5.2.0)
       rack (~> 2.0)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.1.6)
-      activesupport (= 5.1.6)
+    actionview (5.2.0)
+      activesupport (= 5.2.0)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activesupport (5.1.6)
+    activesupport (5.2.0)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
@@ -76,9 +76,9 @@ GEM
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.0.4)
       loofah (~> 2.2, >= 2.2.2)
-    railties (5.1.6)
-      actionpack (= 5.1.6)
-      activesupport (= 5.1.6)
+    railties (5.2.0)
+      actionpack (= 5.2.0)
+      activesupport (= 5.2.0)
       method_source
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)

lib/psenv/version.rb

@@ -1,3 +1,3 @@
 module Psenv
-  VERSION = "0.2.1".freeze
+  VERSION = "0.3.0".freeze
 end

psenv-rails.gemspec

@@ -23,5 +23,5 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "psenv", Psenv::VERSION
-  spec.add_dependency "railties", ">= 3.2", "< 5.2"
+  spec.add_dependency "railties", ">= 3.2", "< 5.3"
 end