pkg: lock gl-shader to 4.2.0

- gl-pointcloud2d will still use [email protected], but
  every other module will use 4.2.0

Author: etpinard

Diff for: package.json

@@ -67,11 +67,12 @@
     "gl-mesh3d": "^1.2.0",
     "gl-plot2d": "^1.1.6",
     "gl-plot3d": "^1.5.0",
+    "gl-pointcloud2d": "^1.0.0",
     "gl-scatter2d": "^1.0.5",
     "gl-scatter2d-fancy": "^1.1.1",
-    "gl-pointcloud2d": "^1.0.0",
     "gl-scatter3d": "^1.0.4",
     "gl-select-box": "^1.0.1",
+    "gl-shader": "4.2.0",
     "gl-spikes2d": "^1.0.1",
     "gl-surface3d": "^1.2.3",
     "mapbox-gl": "^0.22.0",