Cleaning up dependency

[billy1624]

PR Info

Caret requirements are an alternative syntax for the default strategy, ^1.2.3 is exactly equivalent to 1.2.3.

https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#caret-requirements

To make the dependency specification clear and concise, I'd like to define it all in the form of x.y.z.

Changes

• changed all version = "^x.y.z" into version = "x.y.z"
• disable default features and enable only the needed ones

[tyt2y3]

✅