Explicitly ignore vendor/bin to not need to bump the minimum version

.hhconfig

@@ -1,6 +1,6 @@
 assume_php=false
 enable_experimental_tc_features = no_fallback_in_namespaces, unpacking_check_arity, disallow_refs_in_array, disallow_untyped_lambda_as_non_function_type
-ignored_paths = [ "vendor/.+/tests/.+", "vendor/.+/bin/.+", "testdata/fixtures/.+\.tmp\..+\.hack", "testdata/fixtures/xhp-class/.+" ]
+ignored_paths = [ "vendor/.+/tests/.+", "vendor/.+/bin/.+", "testdata/fixtures/.+\.tmp\..+\.hack", "testdata/fixtures/xhp-class/.+", "vendor/bin/.+" ]
 safe_array = true
 safe_vector_array = true
 disallow_destruct = true