First try at Laravel 8

[andresayej]

No description provided.

[codecov]

Codecov Report

Merging #491 into 3.x will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##                3.x     #491   +/-   ##
=========================================
  Coverage     86.92%   86.92%           
  Complexity      369      369           
=========================================
  Files           103      103           
  Lines          1078     1078           
=========================================
  Hits            937      937           
  Misses          141      141           

Impacted Files	Coverage Δ	Complexity Δ
src/Commands/Migrate.php	93.75% <100.00%> (ø)	5.00 <1.00> (ø)
src/TenancyServiceProvider.php	96.55% <100.00%> (ø)	6.00 <0.00> (ø)

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[stancl]

Verified that this works on a 7.x app.