Fix travis failure if previous travis run on branch failed to build

[TheBlueMatt]

No description provided.

[codecov]

Codecov Report

Merging #368 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #368      +/-   ##
==========================================
- Coverage   87.34%   87.33%   -0.02%     
==========================================
  Files          29       29              
  Lines       15605    15605              
==========================================
- Hits        13630    13628       -2     
- Misses       1975     1977       +2

Impacted Files	Coverage Δ
src/ln/channelmanager.rs	81.31% <0%> (-0.16%)	⬇️
src/ln/channel.rs	84.48% <0%> (-0.05%)	⬇️
src/ln/functional_tests.rs	96.32% <0%> (+0.05%)	⬆️

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