Update dependecies. Release v0.10.8

[dr-orlovsky]

This PR only updates dependencies to the latest version + fixes clippy lints. It requires to merge #175 first

[codecov]

Codecov Report

Merging #174 (6176df9) into master (097db48) will decrease coverage by 12.1%.
Report is 644 commits behind head on master.
The diff coverage is 29.3%.

@@            Coverage Diff            @@
##           master    #174      +/-   ##
=========================================
- Coverage    24.9%   12.8%   -12.1%     
=========================================
  Files          25      30       +5     
  Lines        1505    3073    +1568     
=========================================
+ Hits          375     394      +19     
- Misses       1130    2679    +1549     

Flag	Coverage Δ
rust	12.8% <29.3%> (?)

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Files	Coverage Δ
src/contract/assignments.rs	1.0% <ø> (+1.0%)	⬆️
src/schema/state.rs	13.9% <ø> (ø)
src/stl.rs	100.0% <ø> (ø)
src/validation/consignment.rs	0.0% <ø> (ø)
src/validation/model.rs	0.0% <ø> (ø)
src/validation/schema.rs	0.0% <ø> (ø)
src/validation/script.rs	0.0% <ø> (ø)
src/validation/state.rs	0.0% <ø> (ø)
src/validation/status.rs	0.0% <ø> (ø)
src/validation/validator.rs	0.0% <ø> (ø)
... and 20 more

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