Update d3-timer.

Author: mbostock

package.json

@@ -67,7 +67,7 @@
     "d3-shape": "1.2.0",
     "d3-time": "1.0.7",
     "d3-time-format": "2.0.5",
-    "d3-timer": "1.0.6",
+    "d3-timer": "1.0.7",
     "d3-transition": "1.1.0",
     "d3-voronoi": "1.1.2",
     "d3-zoom": "1.5.0"