chore: loosen dependency on asttokens

[ozmium22]

What I did

Loosen pin on asttokens to include a wider range

How I did it

Was

        "asttoken==2.0.5",

Now

        "asttokens>=2.0.5,<3"

How to verify it

Build and pass tests.

Commit message

Loosen dependency on asttokens to >=2.0.5,<3

Resolves: #3148

Description for the changelog

Change asttokens library requirement from ==2.0.5 to >=2.0.5,<3.

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My new puppy:

[codecov-commenter]

Codecov Report

Merging #3149 (2b40304) into master (886488f) will decrease coverage by 0.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3149      +/-   ##
==========================================
- Coverage   88.49%   88.27%   -0.23%     
==========================================
  Files          95       95              
  Lines       10778    10778              
  Branches     2268     2268              
==========================================
- Hits         9538     9514      -24     
- Misses        797      820      +23     
- Partials      443      444       +1     

Impacted Files	Coverage Δ
vyper/ast/annotation.py	94.57% <100.00%> (ø)
vyper/semantics/types/value/numeric.py	80.45% <0.00%> (-4.60%)	⬇️
vyper/builtin_functions/functions.py	89.28% <0.00%> (-1.37%)	⬇️
vyper/compiler/phases.py	90.17% <0.00%> (-0.90%)	⬇️
vyper/cli/vyper_json.py	78.74% <0.00%> (-0.35%)	⬇️
vyper/ir/compile_ir.py	93.55% <0.00%> (-0.17%)	⬇️

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[charles-cooper]

@ozmium22 looks like your change has introduced a mypy issue; could you please fix and repin the lower bound?

[lgtm-com]

This pull request introduces 1 alert when merging d071eb6 into 886488f - view on LGTM.com

new alerts:

• 1 for Module is imported with 'import' and 'import from'

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[ozmium22]

@charles-cooper I added a cast to satisfy the tightened typing in asttokens > 2.0.5. I checked that this now passes the mypy check with all versions of asttokens from 2.0.5 to 2.1.0, so I think pinning to >=2.0.5,<3 should still be okay.