Version 0.3.9-beta-release

Updates introduced since 0.3.8-beta-release

• f1d7a6c Change the ordering of custom fonts. This allows xtermjs to correctly calculate the text line height - (Ni Rui) 82AE11AD1E5E8729 E
• 28e667a Add a 10px padding between the edge of the window and the terminal interface - (Ni Rui) 82AE11AD1E5E8729 E
• 6e3067f Upgrade front end dependencies - (Ni Rui) 82AE11AD1E5E8729 E
• 15f3bab Upgrade backend dependencies - (Ni Rui) 82AE11AD1E5E8729 E