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travis-ci

Don't change Histogram values during Snapshot (#142)

* Calling Snapshot changes recorded Histograms

Update test to call `scope.Snapshot()` repeatedly.

Call `(*counter).snapshot` instead of `(*counter).value` when compiling
a snapshot of histograms, so as not to alter the value of the histogram
during the operation.

2 of 2 new or added lines in 1 file covered. (100.0%)

1003 of 1070 relevant lines covered (93.74%)

366.61 hits per line