travis-ci
Remove `SAFE=1` and `Safe::safe` in tDiary. Ruby 2.6 will be modified scope of SAFE level. https://github.com/ruby/ruby/commit/c39bdb798 It break Thread local usage of SAFE level. So, We gave up to support SAFE mechanism in core module of tDiary.
12 of 12 new or added lines in 3 files covered. (100.0%)
2207 of 2626 relevant lines covered (84.04%)
2056.87 hits per line