Error: undeclared Identifier: 'initInterval'
When Running on nim 1.4.0 `nim r server.nim`

Error:
```
Hint: used config file '/home/sdmca/.choosenim/toolchains/nim-1.4.0/config/nim.cfg' [Conf]
Hint: used config file '/home/sdmca/.choosenim/toolchains/nim-1.4.0/config/config.nims' [Conf]
...................................................................
/home/sdmca/.nimble/pkgs/jester-0.4.3/jester.nim(704, 26) Error: undeclared identifier: 'initInterval'
```

Code:
```
import htmlgen
import jester

routes:
  get "/":
    resp h1("Hello world")
```

