Add missing line to protocols.markdown (elixir-lang#944)

nhooyr · josevalim · commit 04ca7dab86db · 2017-02-03T09:36:03.000+01:00
diff --git a/getting-started/protocols.markdown b/getting-started/protocols.markdown
@@ -83,6 +83,7 @@ In the [previous chapter](/getting-started/structs.html), we have learned that a
 iex> Size.size(%{})
 0
 iex> set = %MapSet{} = MapSet.new
+#MapSet<[]>
 iex> Size.size(set)
 ** (Protocol.UndefinedError) protocol Size not implemented for #MapSet<[]>
 ```

Original file line number	Diff line number	Diff line change
`@@ -83,6 +83,7 @@ In the [previous chapter](/getting-started/structs.html), we have learned that a`
`83`	`83`	`iex> Size.size(%{})`
`84`	`84`	`0`
`85`	`85`	`iex> set = %MapSet{} = MapSet.new`
	`86`	`+#MapSet<[]>`
`86`	`87`	`iex> Size.size(set)`
`87`	`88`	`** (Protocol.UndefinedError) protocol Size not implemented for #MapSet<[]>`
`88`	`89`	```