Add support for forward references

[tiangolo]

✨ Add support for forward references.

Related to #43

[github-actions]

🚀 Deployed on https://5ea58c403ea00915344ef356--typertiangolo.netlify.app

[github-actions]

🚀 Deployed on https://5ea58dc7d0093b8fe32f0ad3--typertiangolo.netlify.app

[codecov-io]

Codecov Report

Merging #93 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #93   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          213       214    +1     
  Lines         4016      4046   +30     
=========================================
+ Hits          4016      4046   +30     

Impacted Files	Coverage Δ
tests/test_others.py	100.00% <100.00%> (ø)
typer/completion.py	100.00% <100.00%> (ø)
typer/models.py	100.00% <100.00%> (ø)
typer/utils.py	100.00% <100.00%> (ø)

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