v0.18.4 Tantalum 2017-12-10

• Show warning comments near the location of the code. (#374, #394) - @Konstantin8105
• Add comment for expressions in ast package. (#432, #436) - @Konstantin8105
• Add comments in util.goast (#437) - @Konstantin8105
• Add test for Go keywords in C functions. (#422, #439) - @Konstantin8105
• Add support for variables named _. (#420, #438) - @Konstantin8105
• Initialization part of switch. (#431, #440) - @Konstantin8105