Grammatical mistake

It seems that specification may not agree in number with other words in this phrase.

Author: 74616e696d

README.md

@@ -12,7 +12,7 @@
 
 The SDK Generator uses predefined language settings as [Twig templates](https://twig.symfony.com/) to generate codebases based on different API specs.
 
-Currently, the only spec supported is Swagger 2.0, but we intend to add support for more specification in the near future. This generator is still lacking support for any definition/models specs.
+Currently, the only spec supported is Swagger 2.0, but we intend to add support for more specifications in the near future. This generator is still lacking support for any definition/models specs.
 
 ## Getting Started