provider: Ensured Go 1.11 in TravisCI and README

provider: Run go fix provider: Run go fmt provider: Encode go version 1.11.5 to .go-version file
heroku · Feb 20, 2019 · 41f402d · 41f402d
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commit 41f402d
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diff --git a/.go-version b/.go-version
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+1.11.5