Upgraded Ruby to 2.6.1

.ruby-version

@@ -1 +1 @@
-2.5.3
+2.6.1

Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.5.3
+FROM ruby:2.6.1
 RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
 RUN mkdir /myapp
 WORKDIR /myapp

Gemfile

@@ -4,7 +4,7 @@ source "https://rubygems.org"
 #don't upgrade
 gem "rails", "5.1.6.1"
 
-ruby "2.5.3"
+ruby "2.6.1"
 
 gem "aruba"
 gem "bcrypt"

Gemfile.lock

@@ -379,7 +379,7 @@ DEPENDENCIES
   unicorn
 
 RUBY VERSION
-   ruby 2.5.3p105
+   ruby 2.6.1p33
 
 BUNDLED WITH
    1.17.3