Use return $this instead of static as we're working with builders so the same instances are being returned

[simPod]

No description provided.

[codecov]

Codecov Report

Merging #110 (fdbfbf0) into 0.5.x (b9dd8ca) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            0.5.x     #110   +/-   ##
=======================================
  Coverage   96.75%   96.75%           
=======================================
  Files           9        9           
  Lines         154      154           
=======================================
  Hits          149      149           
  Misses          5        5           

Impacted Files	Coverage Δ
src/Builder/EnumBuilder.php	100.00% <ø> (ø)
src/Builder/FieldBuilder.php	100.00% <ø> (ø)
src/Builder/InterfaceBuilder.php	100.00% <ø> (ø)
src/Builder/ObjectBuilder.php	100.00% <ø> (ø)
src/Builder/TypeBuilder.php	100.00% <ø> (ø)
src/Builder/UnionBuilder.php	100.00% <ø> (ø)

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