[DOCS] Fix YAML parse error

Author: lcawl

conf.yaml

@@ -227,7 +227,7 @@ contents:
                   -
                     repo:   docs
                     path:   shared
-                    exclude_branches: [ 5.4, 5.3, 5.2, 5.1, 5.0, 2.4, 2.3, 2.2, 2.1, 2.0, 1.7, 1.6, 1.5, 1.4, 1.3, 0.90]                                    
+                    exclude_branches: [ 5.4, 5.3, 5.2, 5.1, 5.0, 2.4, 2.3, 2.2, 2.1, 2.0, 1.7, 1.6, 1.5, 1.4, 1.3, 0.90 ]
                   -
                     repo:   elasticsearch
                     path:   docs/Versions.asciidoc