@elseif deprecated

[brysonreece]

Heads up, it seems Sass is dropping support for the @elseif operator.

Deprecation Warning on line 52, column 4 of node_modules/skeleton-sass-official/skeleton/core/_functions.scss: 
@elseif is deprecated and will not be supported in future Sass versions.
Use "@else if" instead.
	} @elseif($use-em == true and $use-rem == false and $use-percent == false) {
	  ^^^^^^^

Deprecation Warning on line 54, column 4 of node_modules/skeleton-sass-official/skeleton/core/_functions.scss: 
@elseif is deprecated and will not be supported in future Sass versions.
Use "@else if" instead.
	} @elseif($use-percent == true and $use-rem == false and $use-em == false) {
	  ^^^^^^^

Deprecation Warning on line 44, column 4 of node_modules/skeleton-sass-official/skeleton/core/_mixins.scss: 
@elseif is deprecated and will not be supported in future Sass versions.
Use "@else if" instead.
	} @elseif($use-em and not $use-rem and not $use-percent) {
	  ^^^^^^^

Deprecation Warning on line 46, column 4 of node_modules/skeleton-sass-official/skeleton/core/_mixins.scss: 
@elseif is deprecated and will not be supported in future Sass versions.
Use "@else if" instead.
	} @elseif($use-percent and not $use-rem and not $use-em) {