Fix the crate version in Cargo.toml

This is the same as in v0.2.0, with the crate version inCargo.toml updated.

0.2

Improvements from 0.1 include:

• Proper #if expression parsing. By @JCapucho and @fintelia (as well as expression support for #line).
• Support for scientific notation floats. By @Kangz.
• Changes to the Token location information to include a size and offset inside the source &str. By @JCapucho (and small changes by @Kangz).
• Support for unicode tokens and comments. By @JCapucho.
• A fuzzing sub-crate based on afl.rs that found a couple issues that were quickly squashed. By @JCapucho.
• Test coverage on CI and improved test coverage. By @Kangz.

v0.1.0: Fix cargo publish

This adds more metadata to Cargo.toml and fixes a compilation error.