Fix peerDependencies

[aki77]

The following dependency errors have been fixed.

├─┬ UNMET PEER DEPENDENCY @textcomplete/core@0.1.2
│ └── eventemitter3@4.0.4
└─┬ @textcomplete/textarea@0.1.2
  ├── UNMET PEER DEPENDENCY @textcomplete/core@0.1.2 deduped
  ├── @textcomplete/utils@0.1.2
  ├── @types/textarea-caret@3.0.0
  ├── textarea-caret@3.1.0
  └── undate@0.3.0

npm ERR! peer dep missing: @textcomplete/core@^0.0.0, required by @textcomplete/textarea@0.1.2
npm ERR! peer dep missing: @textcomplete/core@^0.0.0, required by @textcomplete/textarea@0.1.2

[yuku]

LGTM!

[aki77]

Thanks!