Bump contour & glslify deps

Author: dy

package.json

@@ -70,7 +70,7 @@
     "es6-promise": "^3.0.2",
     "fast-isnumeric": "^1.1.1",
     "font-atlas-sdf": "^1.3.3",
-    "gl-contour2d": "^1.1.2",
+    "gl-contour2d": "^1.1.4",
     "gl-error3d": "^1.0.7",
     "gl-heatmap2d": "^1.0.3",
     "gl-line3d": "^1.1.1",
@@ -83,6 +83,7 @@
     "gl-select-box": "^1.0.1",
     "gl-spikes2d": "^1.0.1",
     "gl-surface3d": "^1.3.3",
+    "glslify": "^6.1.0",
     "has-hover": "^1.0.1",
     "kdgrass": "^1.0.1",
     "mapbox-gl": "^0.22.0",
@@ -122,7 +123,6 @@
     "fs-extra": "^2.0.0",
     "fuse.js": "^3.2.0",
     "glob": "^7.0.0",
-    "glslify": "^4.0.0",
     "gzip-size": "^4.1.0",
     "image-size": "^0.6.2",
     "into-stream": "^3.1.0",