Fix various issues (import style, type on Writer)

src/color.ts

@@ -1,5 +1,5 @@
 import {Chalk} from 'chalk'
-import {Level} from 'types'
+import {Level} from './types'
 
 const chalk = new Chalk({ level: 2 }) // 256 colors
 

src/logger.ts

@@ -1,5 +1,5 @@
-import {Level, type Options, type Writer} from 'types'
-import {get_color} from 'color'
+import {Level, type Options, type Writer} from './types'
+import {get_color} from './color'
 
 export const writers = new Map<string, Writer>
 export let options: Options = {