message: remove unused semantic version constructor
diff: @@ -43,12 +43,6 @@ struct SemanticVersion {
  patch_version_ = patch;
  }
  - SemanticVersion(const SemanticVersion& other) {
  - major_version_ = other.major_version_;
  - minor_version_ = other.minor_version_;
  - patch_version_ = other.patch_version_;
  - }
  -
  SemanticVersion(const std::string& versionString)
  : major_version_(0), minor_version_(0), patch_version_(0) {
  int readElements = sscanf(versionString.c_str(),
  