Add operator 'StartWith'

[utilForever]

This revisions includes:

• Add operator 'StartWith' (See http://reactivex.io/documentation/operators/startwith.html)
  • Create struct 'StartWithOp'
  • Add function 'start_with()'

[mergify]

Welcome to rxRust!
We're delighted to have you onboard <3

[mergify]

This pull request does not keep the same code style as this project. Could you fix it? 🙏 Switch to the nightly compiler (with rustup rustup default nightly) then run cargo fmt to get more details.

[codecov]

Codecov Report

Merging #168 (0c1e35d) into master (0135d6d) will decrease coverage by 0.01%.
The diff coverage is 93.54%.

@@            Coverage Diff             @@
##           master     #168      +/-   ##
==========================================
- Coverage   95.73%   95.71%   -0.02%     
==========================================
  Files          62       63       +1     
  Lines        4407     4438      +31     
==========================================
+ Hits         4219     4248      +29     
- Misses        188      190       +2     

Impacted Files	Coverage Δ
src/ops.rs	100.00% <ø> (ø)
src/ops/start_with.rs	92.59% <92.59%> (ø)
src/observable.rs	96.79% <100.00%> (+0.04%)	⬆️

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[M-Adoo]

Thanks, it's looks good to me. And for implement local and shared observable, do you think macro impl_local_shared_both is a better choice?

[utilForever]

@M-Adoo Okay, I'll try it right now. 😉

[mergify]

Clippy helps us to improve our Rust code. Could you fix it? 🙏 Run cargo clippy --all-targets --all-features -- -D warnings to get more details.

[utilForever]

@M-Adoo I checked cargo fmt and cargo clippy and saw no warning and error. Could you re-run it? ⛏️

[M-Adoo]

@utilForever seems ci network error, I'll rerun it.