Merge pull request #52 from alexhornbake/alex/fix_update_cleanup_bug

remove uneeded if statement

add another test case in TestCleanupUpdate

fix bug where updated snapshots are removed in cleanup after update

wrap writing to allsnapshots in mutex

Merge pull request #49 from rafaeljusto/endline-docs

Add hint about end line issues in git repositories

Merge pull request #50 from alexhornbake/ah-assertable-helpers

add golang 1.11.x to travis

rename examples to fix go vet issues

remove golang 1.8 (no longer supported) in travis config

missing close } after merge...

Merge branch 'master' into ah-assertable-helpers

add snapshot tests for syntactic sugar helpers: String() and Interface()

Change Struct to Interface... more accurate