add exports for non-decorator usage to index.ts. fixes #152.

Author: jauntywunderkind

src/index.ts

@@ -1,6 +1,7 @@
-export * from './bind.js'
-export * from './register.js'
-export * from './findtarget.js'
-export * from './target.js'
-export * from './controller.js'
-export * from './attr.js'
+export {bind, listenForBind} from './bind.js'
+export {register} from './register.js'
+export {findTarget, findTargets} from './findtarget.js'
+export {target, targets} from './target.js'
+export {controller} from './controller.js'
+export {attr, initializeAttrs, defineObservedAttributes} from './attr.js'
+export {autoShadowRoot} from './auto-shadow-root.js'