Don’t require a specific Ruby version

Gemfile

@@ -1,4 +1,3 @@
 gemspec
 
 source 'https://rubygems.org'
-ruby '2.5.1'

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    stealth-aws-comprehend (0.9.2)
+    stealth-aws-comprehend (0.9.3)
       aws-sdk-comprehend (~> 1.0)
       stealth (< 2.0)
 
@@ -34,18 +34,18 @@ GEM
       tzinfo (~> 1.1)
     arel (9.0.0)
     aws-eventstream (1.0.1)
-    aws-partitions (1.106.0)
+    aws-partitions (1.107.0)
     aws-sdk-comprehend (1.8.0)
       aws-sdk-core (~> 3, >= 3.26.0)
       aws-sigv4 (~> 1.0)
-    aws-sdk-core (3.35.0)
+    aws-sdk-core (3.36.0)
       aws-eventstream (~> 1.0)
       aws-partitions (~> 1.0)
       aws-sigv4 (~> 1.0)
       jmespath (~> 1.0)
     aws-sigv4 (1.0.3)
     builder (3.2.3)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.2)
     connection_pool (2.2.2)
     crass (1.0.4)
     diff-lcs (1.3)
@@ -56,7 +56,7 @@ GEM
     loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
-    method_source (0.9.0)
+    method_source (0.9.1)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
     multi_json (1.13.1)
@@ -81,7 +81,7 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
     rake (12.3.1)
-    redis (4.0.2)
+    redis (4.0.3)
     rspec (3.8.0)
       rspec-core (~> 3.8.0)
       rspec-expectations (~> 3.8.0)
@@ -126,8 +126,5 @@ DEPENDENCIES
   rspec (= 3.8.0)
   stealth-aws-comprehend!
 
-RUBY VERSION
-   ruby 2.5.1p57
-
 BUNDLED WITH
    1.16.3