Release 4.0.0

• update release-it config (e60c80a)
• Merge pull request #532 from ef4/v2-addon (fff89b6)
• readme (b7e0e3d)
• make sure moment is really optional... (769bc10)
• don't send extra events during destruction (d000659)
• testdouble needs to skip babel when compiling for ie11 (c60a7fa)
• fix template lint (d8b8228)
• fix formatting in readme (2a6316c)
• test-app should use same aliases in embroider and ember-auto-import (35780bd)
• updating readme (820aa67)
• illustrating modifier (a8cce94)
• moment is optional if you only use the new modifier (d150b99)
• oldest supported in 3.25 (0ca8769)
• @ember/test-helpers is an optional peerDep (a9bf400)
• cleaning up deprecations (6867509)
• get all remaining lint rules up to current (6a2b8e3)
• completed refactor onto modifier (6a362a4)
• needed for tracked properties (0d15ca0)
• new implementation of PikadayInput has all tests passing (ceb8c42)
• beginning to port to a modifier-based implementation (6eb273e)
• starting updates to readme (2ce6941)
• switch to colocated templates (88ec186)
• fix ember/no-get rule (0cd2199)
• support either moment or moment-timezone (67a31fa)
• typo (3667a40)
• disablin new lint rules that don't pass yet (3f914ff)
• porting to v2 addon format (4768da3)
• Bump eslint-config-prettier from 6.10.1 to 6.11.0 (#342) (19366ea)
• [Security] Bump jquery from 3.4.1 to 3.5.0 (#338) (5179d29)
• Bump qunit-dom from 1.1.0 to 1.2.0 (#335) (3f763be)
• Bump ember-cli-htmlbars from 4.2.3 to 4.3.1 (#330) (4515144)
• Bump ember-cli-babel from 7.18.0 to 7.19.0 (#313) (7436c19)
• Merge pull request #322 from Turbo87/npmignore (cc01a93)
• Merge pull request #321 from Turbo87/deps (b3714ba)
• Update .npmignore file (827e172)
• Remove unused dev dependencies (80585be)
• package.json: Use caret constraint for eslint dependency (f89a5fc)