Install alinode according to the node version

Author: zidong.pei

install_alinode.sh

@@ -5,12 +5,16 @@ echo TRAVIS_NODE_VERSION = $TRAVIS_NODE_VERSION
 
 if [ $TRAVIS_NODE_VERSION -eq '6' ];then
     tnvm install alinode-v2.9.0
+    tnvm use alinode-v2.9.0
 elif [ $TRAVIS_NODE_VERSION -eq '8' ];then
     tnvm install alinode-v3.16.0
+    tnvm use alinode-v3.16.0
 elif [ $TRAVIS_NODE_VERSION -eq '10' ];then
     tnvm install alinode-v4.13.2
+    tnvm use alinode-v4.13.2
 else
     tnvm install alinode-v6.4.4
+    tnvm use alinode-v6.4.4
 fi
 
 tnvm current