add gl-streamtube to package.json

Author: kig

package.json

@@ -84,6 +84,7 @@
     "gl-select-box": "^1.0.2",
     "gl-spikes2d": "^1.0.1",
     "gl-surface3d": "^1.3.4",
+    "gl-streamtube3d": "git@github.com:gl-vis/gl-streamtube3d",
     "glslify": "^6.1.1",
     "has-hover": "^1.0.1",
     "has-passive-events": "^1.0.0",