v0.3.0

What's Changed

• Add textproto parser by @jeongukjae in #32
• add text proto symbol provider by @jeongukjae in #43
• Update overall tests and enable option for linters by @jeongukjae in #45
• add codecov integration by @jeongukjae in #46
• improve tests by @jeongukjae in #47
• Fix proto3 format and add test case for proto3 format by @jeongukjae in #49
• Improve language feature tests and bug fixes by @jeongukjae in #50

Full Changelog: v0.2.1...v0.3.0