chore: bump node engine to v12.22.0 (closes #322)

[nolddor]

Engine constraint is not correct as is lower than used dependencies, closes (#322)

nolddor@computer:~/node-steam-tradeoffer-manager$ node -v
v4.0.0

nolddor@computer:~/node-steam-tradeoffer-manager$ npm -v
2.14.2

nolddor@computer:~/node-steam-tradeoffer-manager$ npm i
npm WARN engine [email protected]: wanted: {"node":">=6.0.0"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine @doctormckay/[email protected]: wanted: {"node":">=6.0.0"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN deprecated [email protected]: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN engine [email protected]: wanted: {"node":">=6.9.0"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">= 6"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">=12.22.0"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN deprecated [email protected]: this library is no longer supported
npm WARN deprecated [email protected]: Please upgrade  to version 7 or higher.  Older versions may use Math.random() in certain circumstances, which is known to be problematic.  See https://v8.dev/blog/math-random for details.
npm WARN engine [email protected]: wanted: {"node":">=6"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">= 6"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">=6"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">= 10"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">=6.0"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">=12.0.0"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">=𝟏𝟐.𝟐𝟐.𝟎""} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine @doctormckay/[email protected]: wanted: {"node":">=𝟏𝟐.𝟐𝟐.𝟎""} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">=12.0.0"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">=6"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">= 6.0.0"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">= 10.0.0","npm":">= 3.0.0"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">= 12"} (current: {"node":"4.0.0","npm":"2.14.2"})
npm WARN engine [email protected]: wanted: {"node":">= 6.0.0","npm":">= 3.0.0"} (current: {"node":"4.0.0","npm":"2.14.2"})