v2.2.0
Fixed DiffInYears、DiffInMonths、DiffAbsInYears、DiffAbsInMonths methods https://github.com/golang-module/carbon/issues/154
Optimized parse method, make it smarter and general https://github.com/golang-module/carbon/issues/131 https://github.com/golang-module/carbon/issues/155