Variables is spelled incorrectly

[aaronjim]

vsts-variable-hydration-tasks/variabledehydration-task/task.json

Line 43 & 46

vsts-variable-hydration-tasks/variabledehydration-task/dehydrate-veriables.ps1
vsts-variable-hydration-tasks/variablerehydration-task/rehydrate-veriables.ps1

vsts-variable-hydration-tasks/variablerehydration-task/task.json

Line 5, 35, & 38