Test fails with node >= 10

[guimard]

Hello,

I had to add this patch to make tests work:

--- a/test/tests.js
+++ b/test/tests.js
@@ -173,7 +173,7 @@
     var duplexStream = duplexer3(writable, readable);
     duplexStream.end("aaa");

-    assert.equal(readable._readableState.flowing, null);
+    assert.equal(readable._readableState.flowing, false);

     var transformStream = new stream.Transform({
       transform: function(chunk, encoding, cb) {
@@ -183,10 +183,10 @@
     });
     writable.pipe(transformStream).pipe(readable);

-    assert.equal(readable._readableState.flowing, null);
+    assert.equal(readable._readableState.flowing, false);

     setTimeout(function() {
-      assert.equal(readable._readableState.flowing, null);
+      assert.equal(readable._readableState.flowing, false);

       var src = "";
       duplexStream.on("data", function(buf) {
@@ -198,7 +198,7 @@
         done();
       });

-      assert.equal(readable._readableState.flowing, null);
+      assert.equal(readable._readableState.flowing, false);
     });
   });