update insertion_sort

snippets/spread.md

@@ -1,19 +1,19 @@
-### spread
-
-Implements javascript's `[].concat(...arr)`. Flattens the list(non-deep) and returns an list.
-
-```python
-def spread(arg):
-    ret = []
-    for i in arg:
-        if isinstance(i, list):
-            ret.extend(i)
-        else:
-            ret.append(i)
-    return ret
-```
-
-
-```python
-spread([1,2,3,[4,5,6],[7],8,9]) # [1,2,3,4,5,6,7,8,9]
+### spread
+
+Implements javascript's `[].concat(...arr)`. Flattens the list(non-deep) and returns an list.
+
+```python
+def spread(arg):
+    ret = []
+    for i in arg:
+        if isinstance(i, list):
+            ret.extend(i)
+        else:
+            ret.append(i)
+    return ret
+```
+
+
+```python
+spread([1,2,3,[4,5,6],[7],8,9]) # [1,2,3,4,5,6,7,8,9]
 ```