Fix README tests formatation (#29)

Now the formatation is correct... ## Tests ```ruby ruby -Ilib -Iext/libnativemath test/test_parsec.rb ``` * Use Ruby version 2.5.1
oxeanbits · Feb 13, 2019 · 02b62b1 · 02b62b1
1 parent d748493
commit 02b62b1
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/README.md b/README.md
@@ -12,7 +12,9 @@ gem 'parsecs'
 
 ## Tests
 
+```ruby
 ruby -Ilib -Iext/libnativemath test/test_parsec.rb
+```
 
 * Use Ruby version 2.5.1