v4.0.0

• Update lock (3201306)
• Update readme (4e76186)
• Refresh the project - Node > 10 | Ember > 3.16 | No mixins (#70) (5340744)
• Update and rename .github/workflows/main.yml to main.yml (deff2c8)
• Update main.yml (8edb534)
• Update to Ember 3.9 (#69) (4b229e1)
• Fix computed property overridability deprecation warnings (#68) (b9fc6b4)