Toggle Quotes is a plugin for Sublime Text. It converts single quotes to double quotes and double quotes to single quotes for the currently selected region, if available, else for the current line.
Edit -> Toggle Quotes
- Linux:    
ctrl+alt+' - Mac:      
super+option+', orsuper+ctrl+' - Windows:  
ctrl+alt+' 
Settings -> Package Settings -> Toggle Quotes -> Key Bindings
- Add this repository to Package Control
 
- Search the Sublime Text command pallet (Super + Shift + P) for 
Package Control: Add Repository. - Enter 
https://github.com/pdobb/ToggleQuotes.gitinto the text box. 
See https://stackoverflow.com/a/44441455/171183 for more detail on this.
- Install ToggleQuotes via Package Control
 
- Search the Sublime Text command pallet again, for 
Package Control: Install Package. - Enter 
ToggleQuotesto install.