Update 'readme.md'

readme.md

@@ -1,2 +1,2 @@
-<h1>Installing Elixir in Ubuntu</h1>
-<h2>Tested for Ububtu 20.04</h2>
+# <h1>Installing Elixir in Ubuntu</h1>
+### <h2>Tested for Ububtu 20.04</h2>