use 2021 edition

[jimexist]

cc @andygrove and @Dandandan

[coveralls]

Pull Request Test Coverage Report for Build 1488335840

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 37 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-0.3%) to 89.949%

---

Files with Coverage Reduction	New Missed Lines	%
src/ast/data_type.rs	1	76.32%
src/ast/query.rs	1	87.08%
src/ast/value.rs	1	86.67%
src/ast/ddl.rs	2	81.67%
src/ast/mod.rs	5	72.21%
src/tokenizer.rs	7	90.61%
src/parser.rs	20	84.98%

Totals
Change from base Build 1342693636:	-0.3%
Covered Lines:	5781
Relevant Lines:	6427

---

💛 - Coveralls

[houqp]

looks like this resulted in couple new linting errors.

UPDATE: nvm, this is fixed by #367

[alamb]

I merged main into this branch too and if it passes CI I'll merge this one in too

[alamb]

Last clippy warning: #374

[alamb]

Its now passing 🎉