Remove Slow Parameters for Release Profile in Cargo.toml

[WyvernIXTL]

markdown-oxide/Cargo.toml

Lines 37 to 39 in 46ec5ca

	[profile.release]
	codegen-units = 1
	lto = true

Compiling from source with cargo install is very slow due to setting codegen-units = 1.

Instead it'd be better to have a separate optimized profile for ci:

[profile.optimized-release]
inherits = "release"
opt-level = 3
lto = "fat"
codegen-units = 1

This way ci takes its time to produce optimized binaries, while installs with cargo install are not terribly slow.