remove discore-children dependency

Added getChildren function to replace it.

index.js

@@ -1,43 +1,52 @@
-var matches = require('matches-selector')
-var getChildren = require('children')
+var matches = require("matches-selector")
 
 module.exports = Siblings
 
 function Siblings(el, selector) {
-  return getChildren(el.parentNode, selector)
-  .filter(function (sib) {
-    return sib !== el
-  })
+    return getChildren(el.parentNode, selector).filter(function(sibling) {
+        return sibling !== el;
+    })
 }
 
-Siblings.next = traverse('next')
-Siblings.prev = traverse('previous')
+function getChildren(el, selector) {
+    var selection;
+
+    if (selector) {
+        selection = Array.prototype.slice.call(el.querySelectorAll(selector), 0);
+    } else {
+        selection = Array.prototype.slice.call(el.children, 0);
+    }
+    return selection;
+}
+
+Siblings.next = traverse("next")
+Siblings.prev = traverse("previous")
 
 function traverse(dir) {
-  var prop = dir + 'ElementSibling'
+    var prop = dir + "ElementSibling"
 
-  return function (el, selector, limit) {
-    if (typeof selector === 'number') {
-      limit = selector
-      selector = null
-    }
+    return function(el, selector, limit) {
+        if (typeof selector === "number") {
+            limit = selector
+            selector = null
+        }
 
-    var siblings = []
-    var sibling = el
+        var siblings = []
+        var sibling = el
 
-    while (true) {
-      if (!(sibling = sibling[prop]))
-        break
+        while (true) {
+            if (!(sibling = sibling[prop]))
+                break
 
-      if (selector && !matches(sibling, selector))
-        continue
+            if (selector && !matches(sibling, selector))
+                continue
 
-      siblings.push(sibling)
-      
-      if (limit && siblings.length >= limit)
-        break
-    }
+            siblings.push(sibling)
+
+            if (limit && siblings.length >= limit)
+                break
+        }
 
-    return limit === 1 ? siblings.shift() : siblings
-  }
-}
+        return limit === 1 ? siblings.shift() : siblings
+    }
+}