Unknown Source contributing incorrect supported values for sublime-settings

[alanCarpenter-Trov]

Trying to modify the Sublime file_tab_style is met with

warning Value is not accepted. Valid values: "rounded", "squared", "angled". ​unknown-source:1

When the choice of "Squared" is selected the tabs section breaks entirely. This is because the actual accepted value is "square"

[Raoul Wols]

Thanks for the report! @predragnikolic fixed this in #94, should show up on package control soon.