update ruby

Author: zfletch

.github/workflows/test.yml

@@ -5,16 +5,11 @@ on: [push, pull_request]
 jobs:
   test:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        ruby: ['2.5']
-    name: Ruby ${{ matrix.ruby }} test
     steps:
       - uses: actions/checkout@v2
-
-      - uses: actions/setup-ruby@v1
+      - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: ${{ matrix.ruby }}
+          ruby-version: 2.7
 
       - name: Install bundler
         run: gem install bundler

.ruby-version

@@ -1 +1 @@
-2.5.1
+2.7.0

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org/'
 
-ruby '~> 2.5.1'
+ruby '~> 2.7.0'
 
 gem 'puma'
 gem 'sinatra'

README.md

@@ -52,7 +52,7 @@ services:
 
 Requirements:
 
-- ruby (~2.5)
+- ruby (~2.7)
 - bundler
 
 ```bash