message: Fix changelog typo in 2.18.3
diff: ## `apollo@2.18.3`
  - `apollo`
  - - fix bad parsing of multiple `locaSchemaFile`s [#1529](https://github.com/apollographql/apollo-tooling/pull/1529)
  + - fix bad parsing of multiple `localSchemaFile`s [#1529](https://github.com/apollographql/apollo-tooling/pull/1529)
  ## `apollo@2.18.2`
  