move test -> tests

Just a nit, but our syntax repo calls it tests. Easier copy paste of test scripts

Author: chenglou

.gitignore

@@ -4,7 +4,7 @@
 npm-debug.log
 *.install
 examples/*/lib
-test/lib
+tests/lib
 node_modules
 *.cmi
 *.cmt

package.json

@@ -2,7 +2,7 @@
   "name": "rescript-editor-support",
   "version": "1.0.0",
   "scripts": {
-    "test": "cd test && ./test.sh"
+    "test": "cd tests && ./test.sh"
   },
   "keywords": [
     "rescript",