Added windows support (#368)

[ermakov-oleg]

#368
I tried to build the CLI on a Windows GitHub runner and it seems like there are no problems.

I tested the built binary on one of the Windows machines:

PS C:\Users\...\Downloads> .\squawk-windows-x64.exe --version
squawk 1.1.2
PS C:\Users\...\Downloads> .\squawk-windows-x64.exe 'test.sql'
test.sql:1:0: warning: adding-field-with-default

   1 | ALTER TABLE foo ADD COLUMN bar TEXT NOT NULL DEFAULT "baz";

  note: Adding a field with a VOLATILE DEFAULT requires a table rewrite with an ACCESS EXCLUSIVE lock. In Postgres versions 11+, non-VOLATILE DEFAULTs can be added without a rewrite.
  help: Add the field as nullable, then set a default, backfill, and remove nullability.

find detailed examples and solutions for each rule at https://squawkhq.com/docs/rules
PS C:\Users\...\Downloads>

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[chdsbd]

Thank you!!