Fixed error in v2.rst

shivanshu1234 · shivanshu1234 · commit 7af8e36f5eff · 2019-03-11T21:43:51.000+05:30
diff --git a/docs/config-file/v2.rst b/docs/config-file/v2.rst
@@ -87,7 +87,8 @@ Example:
          - requirements: docs/requirements.txt
          - method: pip
            path: .
-           extra_requirements: docs
+           extra_requirements:
+               - docs
          - method: setuptools
            path: another/package
       system_packages: true
