Update dependency knex to ^0.20.0

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
knex (source)	dependencies	minor	^0.19.0 -> ^0.20.0

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Release Notes

tgriesser/knex

v0.20.0

Compare Source

New features:

• orderBy accepts QueryBuilder #​3491
• Add validation in .offset() #​2908
• disable_migrations_list_validation feature #​3448

Bug fixes:

• Fix oracledb driver v4 support #​3480
• Fix some issues around seed and migration generation #​3479
• Fix bugs in replacement logic used when dropping columns in SQLite #​3476

Typings:

• Add types to the Migrator interface #​3459
• Fix typings of index and dropIndex TableBuilder methods #​3486
• Fixes types for Seeder#run #​3438

Test / internal changes:

• Execute CI on Node.js 13
• Bluebird: remove usage of return, reflect, fromCallback methods #​3483
• Bluebird: remove Bluebird.bind #​3477
• Bluebird: use util.promisify instead of Bluebird.promisify #​3470
• Bluebird: remove Bluebird.each #​3471
• Bluebird: remove Bluebird.map and Bluebird.mapSeries #​3474
• Bluebird: replace Bluebird.map with Promise.all #​3469
• Update badges #​3482

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