Fixing tokio dependency breaking change

[dr-orlovsky]

One of tokio dependencies has updated it's dependencies in minor version and led to Cargo.lock conflict with a patch required for android version. I have temporarily disabled it since it's impossible to update upstream crates (adding any dependency there requires update to the Cargo.lock, which fails due to this problem).

[codecov]

Codecov Report

Merging #156 (04a53c6) into master (064b2f5) will decrease coverage by 0.1%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #156     +/-   ##
========================================
- Coverage    57.8%   57.8%   -0.1%     
========================================
  Files          78      78             
  Lines       12219   11872    -347     
========================================
- Hits         7068    6857    -211     
+ Misses       5151    5015    -136     

Impacted Files	Coverage Δ
src/lib.rs	25.0% <0.0%> (-53.9%)	⬇️
src/rgb/contract/assignments.rs	80.8% <0.0%> (+0.1%)	⬆️
derive/src/lib.rs	83.2% <0.0%> (+18.5%)	⬆️

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[dr-orlovsky]

This think broke everything: miow v0.3.6. They have yanked all previous versions and introduced breaking changes with new one: https://crates.io/crates/miow/versions

[dr-orlovsky]

Removing socket2 pinned version breaks android build, but anyway newly created projects will not be able to use LNP/BP Core library w/o this at all, so better to have android build broken for now (and fix it later) than being unable to plug in LNP/BP core lib into new projects at all