Fix requestMessage doesnt seem to match spec #139
Merged
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In the LSP spec for requestMessage, the params key is optional. However, the code seems to only expect the 3 arity variant. This patch allows both the 2 arity and 3 arity variants, so that the shutdown requests will work (which doesn't include a params key).
Fixes #138
See also:
https://microsoft.github.io/language-server-protocol/specifications/specification-current/#requestMessage