nlsr: Update to version 0.3.1

Change-Id: If60e8c15b411b031bbfe3331957fc851cb19f012
diff --git a/nlsr/Makefile b/nlsr/Makefile
index 8866636..dc18de1 100644
--- a/nlsr/Makefile
+++ b/nlsr/Makefile
@@ -2,13 +2,13 @@
 GIT_URL=https://github.com/named-data/NLSR
 
 # Tag name or commit hash for checkout
-GIT_VERSION=2b057af9e1a695bb72a662b22cc1e8be200356f3
+GIT_VERSION=NLSR-0.3.1
 
 # Package name
 NAME=nlsr
 
 # Package version
-VERSION=0.3.0-13-g2b057af
+VERSION=0.3.1
 
 # PPA version
 PPA_VERSION=1