fix: user secure random generator

[ai]

rndm use Math.random which is predictable and non-secure. nanoid uses hardware random generator which is much faster.

Also nanoid is very fast and popular tool.

[codecov[bot]]

Codecov Report

Merging #43 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #43   +/-   ##
=======================================
  Coverage   95.83%   95.83%           
=======================================
  Files          30       30           
  Lines         480      480           
=======================================
  Hits          460      460           
  Misses         20       20

Impacted Files	Coverage Δ
app/extend/context.js	100% <100%> (ø)	:arrow_up:
lib/middlewares/hsts.js	100% <0%> (ø)	:arrow_up:
lib/safe_redirect.js	100% <0%> (ø)	:arrow_up:

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[ai]

@fengmk2 Good news, everyone :).

1. My Chinese friends added Chinese docs
2. We improved nanoid/non-secure performance and now we are 10% faster

$ ./test/benchmark
nanoid                354,201 ops/sec
nanoid/generate       348,467 ops/sec
uid.sync              325,347 ops/sec
uuid/v4               322,328 ops/sec
shortid                33,277 ops/sec

Async:
uid                    71,998 ops/sec
nanoid/async           72,836 ops/sec

Non-secure:
rndm                2,495,324 ops/sec
nanoid/non-secure   2,746,033 ops/sec

[fengmk2]

@ai thanks a lot!