pref: remove await/async from internal async calls

test/unit/template/value.ts

@@ -1,4 +1,5 @@
 import * as chai from 'chai'
+import { toThenable } from '../../../src/util/async'
 import * as sinonChai from 'sinon-chai'
 import * as sinon from 'sinon'
 import { Context } from '../../../src/context/context'
@@ -120,7 +121,7 @@ describe('Value', function () {
       const scope = new Context({
         foo: { bar: 'bar' }
       })
-      await tpl.value(scope)
+      await toThenable(tpl.value(scope))
       expect(date).to.have.been.calledWith('bar', 'b')
       expect(time).to.have.been.calledWith('y', 2)
     })