reset version number of Table and DatePicker

packages/date-picker/package.json

@@ -1,6 +1,6 @@
 {
   "name": "element-datepicker",
-  "version": "1.0.0",
+  "version": "0.0.0",
   "description": "A datepicker component for Vue.",
   "keywords": [
     "element",

packages/table/package.json

@@ -1,6 +1,6 @@
 {
   "name": "element-table",
-  "version": "1.0.0",
+  "version": "0.0.0",
   "description": "A table component for Vue.",
   "keywords": [
     "element",