fix align of nested data table, react-component/table#25

package.json

@@ -56,7 +56,7 @@
     "rc-slider": "~3.3.0",
     "rc-steps": "~1.4.1",
     "rc-switch": "~1.3.1",
-    "rc-table": "~3.7.0",
+    "rc-table": "~3.7.1",
     "rc-tabs": "~5.5.0",
     "rc-time-picker": "~1.0.0",
     "rc-tooltip": "~3.3.0",

style/components/table.less

@@ -285,6 +285,13 @@
     &-collapsed:after {
       content: '+';
     }
+
+    &-expand-icon&-spaced {
+      visibility: hidden;
+      &:after {
+        content: '.';
+      }
+    }
   }
   tr&-expanded-row {
     &,