0.31.3

Added

• The CARGO_TARPAULIN_CONFIG_FILE environment variable may be used to set the
  path to the configuration file. The command line argument has precedence,
  but this environment variable has precedence over tarpaulin.toml and .tarpaulin.toml.

Changed

• For LD_LIBRARY_PATH get all link paths from build script outputs
• Use PATH on windows and DYLIB_LIBRARY_PATH for mac instead of LD_LIBRARY_PATH
• Add --stderr flag to print tarpaulin logs to stderr