Support for no_std in derivation macros

[dr-orlovsky]

No description provided.

[codecov]

Codecov Report

Merging #86 (99abb94) into master (19cdd5f) will not change coverage.
The diff coverage is n/a.

❗ Current head 99abb94 differs from pull request most recent head 4f68368. Consider uploading reports for the commit 4f68368 to get more accurate results

@@          Coverage Diff           @@
##           master     #86   +/-   ##
======================================
  Coverage    66.2%   66.2%           
======================================
  Files          29      29           
  Lines        3399    3399           
======================================
  Hits         2250    2250           
  Misses       1149    1149           

Impacted Files	Coverage Δ
derive/src/display.rs	77.4% <ø> (ø)
derive/src/from.rs	86.1% <ø> (ø)
derive/src/wrapper.rs	78.2% <ø> (ø)
src/lib.rs	33.7% <ø> (ø)

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