refactor: use camelCase for JavaScript APIs

BREAKING CHANGE: Options and method names in JavaScript API are now renamed to cammelCase, for a complete list see #109

src/template/filter/filter.ts

@@ -21,7 +21,7 @@ export class Filter {
   }
   async render (value: any, scope: Scope) {
     const argv: any[] = []
-    for(let arg of this.args) {
+    for (const arg of this.args) {
       if (isArray(arg)) argv.push([arg[0], await evalValue(arg[1], scope)])
       else argv.push(await evalValue(arg, scope))
     }

src/template/value.ts

@@ -49,7 +49,7 @@ export default class Value {
   }
   async value (scope: Scope) {
     let val = await evalExp(this.initial, scope)
-    for (let filter of this.filters) {
+    for (const filter of this.filters) {
       val = await filter.render(val, scope)
     }
     return val