chore(qiankun): remove unused peerDependencies

[kuitos]

• fix 麻烦升级下qiankun呢 peer react@"16" from @umijs/[email protected] #879
• fix umi-qiankun peerDependencies react16 #940

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (881281c) 44.30% compared to head (5adf1e1) 44.30%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #953   +/-   ##
=======================================
  Coverage   44.30%   44.30%           
=======================================
  Files          67       67           
  Lines        1731     1731           
  Branches      479      476    -3     
=======================================
  Hits          767      767           
  Misses        955      955           
  Partials        9        9           

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