fix(winston): fix unhandledRejection handling for winston@3.12.0 chan…

…ges; release @elastic/ecs-winston-format@1.5.3 (#181)

In winston@3.12.0, the handling of unhandledRejection events changed
slightly: setting '<record>.rejection=true` rather than `<record>.exception`.

chore: release @elastic/ecs-winston-format@1.5.2 (#175)

release @elastic/ecs-morgan-format@1.5.1 (#171)

Also add a doc for how to release/publish packages in this repo.

v1.5.0 (#166)

This will also be the '@elastic/ecs-helpers@2.1.1' release.

v1.5.0 (#166)

This will also be the '@elastic/ecs-helpers@2.1.1' release.

feat: support multiple import styles from JS and TS; add morgan types (…

…#165)

This updates the three @elastic/ecs-*-format packages to support the following
import styles from JS and TS code:
1. `const { ecsFormat } = require('@elastic/ecs-pino-format);` in JS and TS.
   The preferred import style for JS code using CommonJS.
2. `import { ecsFormat } from '@elastic/ecs-pino-format';` in JS and TS.
   ES module (ESM) import style. This is the preferred style for TypeScript
   code and for JS developers using ESM.
3. `const ecsFormat = require('@elastic/ecs-pino-format');` in JS.
   The old, deprecated import method. Still supported for backward compat.
4. `import ecsFormat from '@elastic/ecs-pino-format';` in JS and TS.
   This works, but is deprecated. Prefer #2 style.
5. `import * as EcsPinoFormat from '@elastic/ecs-pino-format';` in TS.
   One must then use `EcsPinoFormat.ecsFormat()`.

Note that this *excludes* support for this TS-only style:
`import escFormat = require('@elastic/ecs-pino-format');`

This also adds types for ecs-morgan-format, based on #119 and #90.
I'd had an earlier start on this in #96.

Replaces: #96
Closes: #90
Closes: #119

feat(winston): improve serialization of Error instances (#158)

This handles the various ways an Error instance can be passed
to a Winston logger, and serializes those Errors to 'error.*'
fields.

Closes: #128

v1.4.0 (#153)