refactor: use '->' instead of ':' for fn return types

[wackbyte]

Closes #105. I updated all of the tests but not the README example.

[codecov]

Codecov Report

Merging #123 into master will decrease coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
- Coverage   78.87%   78.86%   -0.02%     
==========================================
  Files         141      141              
  Lines        8724     8728       +4     
==========================================
+ Hits         6881     6883       +2     
- Misses       1843     1845       +2     

Impacted Files	Coverage Δ
crates/mun_codegen/src/test.rs	97.36% <ø> (ø)
crates/mun_hir/src/tests.rs	84.61% <ø> (ø)
crates/mun_hir/src/ty/tests.rs	96.05% <ø> (ø)
crates/mun_runtime/src/test.rs	98.25% <ø> (ø)
crates/mun_runtime_capi/src/tests.rs	99.29% <ø> (ø)
crates/mun_syntax/src/tests/lexer.rs	100.00% <ø> (ø)
crates/mun_syntax/src/tests/parser.rs	100.00% <ø> (ø)
crates/mun_syntax/src/parsing/parser.rs	80.00% <50.00%> (-0.41%)	⬇️
crates/mun_syntax/src/syntax_kind/generated.rs	64.28% <50.00%> (-0.12%)	⬇️
...tes/mun_syntax/src/parsing/grammar/declarations.rs	88.70% <100.00%> (ø)

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[baszalmstra]

Also, why not change the README? that should reflect what the language looks like currently.

[wackbyte]

I'll update the mun_runtime example as well.

[wackbyte]

It looks like I forgot to add the arrow to the symbols test, too.

[wackbyte]

Did I miss anything else?

[baszalmstra]

Did I miss anything else?

I think you missed these : https://github.com/mun-lang/mun/tree/master/crates/mun_runtime/benches/resources