Add disabled prop

[jakeboone02]

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Sandbox	Source
react-querybuilder-ci	Configuration

[codecov]

Codecov Report

Merging #248 (ee3b7cf) into master (f79e9f5) will not change coverage.
The diff coverage is 100.00%.

❗ Current head ee3b7cf differs from pull request most recent head b473545. Consider uploading reports for the commit b473545 to get more accurate results

@@            Coverage Diff            @@
##            master      #248   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines          994       999    +5     
  Branches       410       414    +4     
=========================================
+ Hits           994       999    +5     

Impacted Files	Coverage Δ
...es/react-querybuilder/src/controls/ValueEditor.tsx	100.00% <ø> (ø)
.../react-querybuilder/src/controls/ValueSelector.tsx	100.00% <ø> (ø)
packages/react-querybuilder/src/QueryBuilder.tsx	100.00% <100.00%> (ø)
packages/react-querybuilder/src/Rule.tsx	100.00% <100.00%> (ø)
packages/react-querybuilder/src/RuleGroup.tsx	100.00% <100.00%> (ø)
.../react-querybuilder/src/controls/ActionElement.tsx	100.00% <100.00%> (ø)
...ages/react-querybuilder/src/controls/NotToggle.tsx	100.00% <100.00%> (ø)

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