Parsing errors per gcov-8

[yangacer]

It seems to me that .gcov generated by gcov-8 can not be parsed correctly. It emits some error messages such as

CMake Warning at cmake/coveralls/cmake/CoverallsGenerateGcov.cmake:412 (message):
  Failed to properly parse line (RES_COUNT = 1)
  /home/travis/build/yangacer/sqlite3cpp/#home#travis#build#yangacer#sqlite3cpp#sqlite3cpp.ipp.gcov:76
  -->------------------
CMake Warning at cmake/coveralls/cmake/CoverallsGenerateGcov.cmake:412 (message):
  Failed to properly parse line (RES_COUNT = 1)
  /home/travis/build/yangacer/sqlite3cpp/#home#travis#build#yangacer#sqlite3cpp#sqlite3cpp.ipp.gcov:77
  
  -->_ZN10sqlite3cpp6detail18foreach_tuple_implISt5tupleIJiiiNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEdEENS0_11get_col_valELi3ELi4EEclERS9_SA_:

Full log is on travis.
https://travis-ci.org/yangacer/sqlite3cpp/builds/542345616

Workaround is to use gcov-7 (with gcc-7). I would like to keep a record here for reference.