modify tex-sections-snippets

vim-snippets/tex.snippets

@@ -2,6 +2,11 @@
 # Section
 snippet sec
 	\section{${1}}
+	\label{sec:${2}}
+# Subsection
+snippet subsec
+	\subsection{${1}}
+	\label{subsec:${2}}
 # Figure
 snippet fig
 	\begin{figure}