Add natural number money input demo

[cncolder]

添加一个例子，限制 money 键盘输入以0开头或包括小数点的数字，只能输入正整数（自然数）。

快照里面 stepper max min 从数值变成 Infinity 了，原因不明，所以没更新快照。

First of all, thank you for your contribution! :-)

Please makes sure that these checkboxes are checked before submitting your PR, thank you!

• Make sure that you follow antd's code convention.
• Run npm run lint and fix those errors before submitting in order to keep consistent code style.
• Rebase before creating a PR to keep commit history clear.
• Add some descriptions and refer relative issues for you PR.

Extra checklist:

if isBugFix :

• Make sure that you add at least one unit test for the bug which you had fixed.

elif isNewFeature :

• Update API docs for the component.
• Update/Add demo to demonstrate new feature.
• Update TypeScript definition for the component.
• Add unit tests for the feature.

---

This change is 

[mention-bot]

@cncolder, thanks for your PR! By analyzing the history of the files in this pull request, we identified @pingan1927 to be a potential reviewer.

[paranoidjk]

snapshot的变更，更新node modules再跑，rc-input-number升级了

[cncolder]

snapshot updated

[codecov]

Codecov Report

Merging #1493 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1493   +/-   ##
=======================================
  Coverage   65.06%   65.06%           
=======================================
  Files         229      229           
  Lines        2290     2290           
  Branches      701      701           
=======================================
  Hits         1490     1490           
  Misses        799      799           
  Partials        1        1

Flag	Coverage Δ
#rn	79.81% <ø> (ø)	⬆️
#web	64.32% <ø> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 07288df...0028afe. Read the comment docs.