chore(deps): update dependency koa to v2.8.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
koa	dependencies	minor	2.7.0 -> 2.8.1
koa	devDependencies	minor	2.7.0 -> 2.8.1

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Release Notes

koajs/koa

v2.8.1

Compare Source

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fixes

• [287e589] - fix: make options more compatibility (dead-horse <mailto:[email protected]>)

v2.8.0

Compare Source

==================

features

• [5afff89] - feat: accept options in the Application constructor (#​1372) (Jake <mailto:[email protected]>)

fixes

• [ff70bdc] - fix: typo on document (#​1355) (Jeff <mailto:[email protected]>)

others

• [3b23865] - docs: parameter of request.get is case-insensitive (#​1373) (Gunnlaugur Thor Briem <mailto:[email protected]>)
• [a245d18] - docs: Update response.socket (#​1357) (Jeff <mailto:[email protected]>)
• [d1d65dd] - chore(deps): install egg-bin, mm as devDeps not deps (#​1366) (Edvard Chen <mailto:<pigeon73101@​gmail.com>>)
• [2c86b10] - test: remove jest and use egg-bin(mocha) (#​1363) (Yiyu He <mailto:[email protected]>)
• [219bf22] - docs(context): update link (#​1354) (Peng Jie <mailto:[email protected]>)
• [52a6737] - chore: ignore Intellij IDEA project files (#​1361) (Imon-Haque <mailto:[email protected]>)
• [b9e3546] - docs(api): fix keygrip link (#​1350) (Peng Jie <mailto:[email protected]>)
• [d4bdb5e] - chore: update eslint and fix lint errors (dead-horse <mailto:[email protected]>)
• [12960c4] - build: test on 8/10/12 (dead-horse <mailto:[email protected]>)
• [00e8f7a] - docs: ctx.type aliases ctx.response, not ctx.request (#​1343) (Alex Berk <mailto:[email protected]>)
• [62f29eb] - docs(context): update cookies link (#​1348) (Peng Jie <mailto:[email protected]>)
• [b7fc526] - docs: fix typo in cookie path default value docs (#​1340) (Igor Adamenko <mailto:[email protected]>)
• [23f7f54] - chore: simplify variable (#​1332) (kzhang <mailto:[email protected]>)
• [132c9ee] - docs: Clarify the format of request.headers (#​1325) (Dobes Vandermeer <mailto:[email protected]>)
• [5810f27] - docs: Removed Document in Progress note in Koa vs Express (#​1336) (Andrew Peterson <mailto:[email protected]>)
• [75233d9] - chore: Consider removing this return statement; it will be ignored. (#​1322) (Vern Brandl <mailto:[email protected]>)
• [04e07fd] - test: Buffer() is deprecated due to security and usability issues. so use the Buffer.alloc() instead (#​1321) (Vern Brandl <mailto:[email protected]>)
• [130e363] - docs: use 'fs-extra' instead of 'fs-promise' (#​1309) (rosald <mailto:[email protected]>)
• [2f2078b] - chore: Update PR-welcome badge url (#​1299) (James George <mailto:<jamesgeorge998001@​gmail.com>>)

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