Fix tests

test.bats

@@ -5,11 +5,11 @@
 }
 
 @test "abra is executable" {
-    abra --help
+    ./abra --help
 }
 
 @test "abra server add/rm works" {
-    abra server add swarm.example.com user 222
+    ./abra server add swarm.example.com user 222
     docker context ls | grep swarm.example.com
-    abra server rm swarm.example.com
+    ./abra server rm swarm.example.com
 }