Update sawtooth-signing requirement from 1.1.3 to 1.1.5#331

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dependabot-preview[bot] wants to merge 1 commit intodevfrom

dependabot/pip/dev/sawtooth-signing-1.1.5

Commits on Apr 22, 2019

Update sawtooth-signing requirement from 1.1.3 to 1.1.5
dependabot-support
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