更新types, 更新travis.yml 最新的npminstall只支持node 8

[mengfei0053]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[codecov]

Codecov Report

Merging #24 (b97f883) into master (c4326d2) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #24   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines            9         9           
=========================================
  Hits             9         9           

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[Runtu4378]

@atian25 大锅，你看这个pr可以合并了吗？最近用到 validator + ts 也遇到了类型提示不明显的情况，利用声明合并怎么都覆盖不了插件里面的类型声明，可能还是从源头上加上类型定义比较好解决一点。

[OnlyFlyer]

返回值建议还是取 Parameter.ValidateError[] 而不是 void ，当校验通过后返回的类型是 Parameter.ValidateError[]，失败直接抛错也不会执行到后续的代码，void 没有意义。

[kerryChen95]

我也遇到了覆盖不了插件中的*.d.ts声明的问题，希望早日Merge这个PR

[andyFang94]

我也遇到了覆盖不了插件中的*.d.ts声明的问题，希望早日Merge这个PR

直接用parameter