Rename leading plugin to lineHeight

defaultConfig.stub.js

@@ -24,7 +24,7 @@ module.exports = {
     fontFamily: ['responsive'],
     fontWeight: ['responsive', 'hover', 'focus'],
     height: ['responsive'],
-    leading: ['responsive'],
+    lineHeight: ['responsive'],
     listStyle: ['responsive'],
     margin: ['responsive'],
     maxHeight: ['responsive'],

defaultTheme.js

@@ -159,7 +159,7 @@ module.exports = function() {
       extrabold: 800,
       black: 900,
     },
-    leading: {
+    lineHeight: {
       none: 1,
       tight: 1.25,
       normal: 1.5,

plugins/leading.js

@@ -1 +0,0 @@
-module.exports = require('../lib/plugins/leading').default

plugins/lineHeight.js

@@ -0,0 +1 @@
+module.exports = require('../lib/plugins/lineHeight').default

src/corePlugins.js

@@ -18,7 +18,7 @@ import float from './plugins/float'
 import fontFamily from './plugins/fontFamily'
 import fontWeight from './plugins/fontWeight'
 import height from './plugins/height'
-import leading from './plugins/leading'
+import lineHeight from './plugins/lineHeight'
 import margin from './plugins/margin'
 import maxHeight from './plugins/maxHeight'
 import maxWidth from './plugins/maxWidth'
@@ -92,7 +92,7 @@ export default function(config) {
     fontFamily,
     fontWeight,
     height,
-    leading,
+    lineHeight,
     margin,
     maxHeight,
     maxWidth,