Updated dependencies

[parrottq]

I was thinking of using this dependency for a project but saw that it was pretty out of date so I spent a little bit of time cleaning it up.

Changes

• Migrated to latest edition
• Updated all the dependencies
• Removed lazy_static because it is no longer needed with new versions of base64
• Fixed the feature flags to be opt-in

Testing

All the units tests except the ones related to diesel pass. I'm getting a link error when I enable the diesel feature flag but I assume that they still pass if you compile the binary in the right environment.

Improved Codegen

I took a look at the asm generated for this snippet on both the current version (master) and after these changes to see the difference in codegen:

// With `lto = true`
#[no_mangle]
#[inline(never)]
pub fn convert(e: UuidB64) -> InlineString {
    e.to_istring()
}

On master there are lots of branch and allocation calls; meanwhile after updating base64 the above function now only contains the following instructions on x86:
add, lea, mov, movabs, movups, movzx, or, ret, shr, sub

I haven't measured the performance difference with a benchmark but presumably this new version will be much faster.

[quodlibetor]

Thanks for this, looks great!

[quodlibetor]

I guess the base64 crate no longer handles whitespace itself (marshallpierce/rust-base64#163) which seems legitimate.

[quodlibetor]

I'm updating the CI in this repo since I haven't touched it really since Travis CI went kapoot, I'll merge this in the next couple days after I get that working.

Thanks again!

[quodlibetor]

0.2.0 has been released, thanks for this!