Add install command target= var to bash completion

priv/shell-completion/bash/rebar

@@ -10,8 +10,8 @@ _rebar()
     lopts=" --help --verbose --force --jobs="
     cmdsnvars="analyze build_plt check_plt clean compile \
         create-app create-node eunit generate \
-        int_test perf_test test \
-        case= force=1 jobs= suite= verbose=1 appid="
+        install int_test perf_test test \
+        case= force=1 jobs= suite= verbose=1 appid= target="
 
     if [[ ${cur} == --* ]] ; then
         COMPREPLY=( $(compgen -W "${lopts}" -- ${cur}) )