export GoOutlineRange, GoOutlineDeclaration, GoOutlineOptions

[nicksnyder]

because they are used in an exported function.

These paths caused me problems when I was trying to pursue method 1 in microsoft/vscode#20623

[17:13:16] Starting 'watch-client'...
[17:14:20] Error: /Users/nick/code/vscode/extensions/vscode-go/src/goOutline.ts(37,42): Parameter 'options' of exported function has or is using private name 'GoOutlineOptions'.
[17:14:20] Error: /Users/nick/code/vscode/extensions/vscode-go/src/goOutline.ts(37,69): Return type of exported function has or is using private name 'GoOutlineDeclaration'.

[msftclas]

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