Get rid of annoying deprecation warnings (#164)

* Get rid of annoying deprecation warnings

Changed existsFile to fileExists and existsDir to dirExists.

* Install packages during nimble develop

.travis.yml

@@ -16,5 +16,5 @@ before_script:
   - set -e
   - export PATH=$(pwd)/nim/bin:$(pwd):$PATH
 script:
-  - nimble develop
+  - nimble develop -y
   - nim c -r tests/tester.nim

karax/tools/static_server.nim

@@ -33,7 +33,7 @@ proc sendStaticIfExists(
   result = Http200
   let mimes = newMimetypes()
   for p in paths:
-    if existsFile(p):
+    if fileExists(p):
 
       var fp = getFilePermissions(p)
       if not fp.contains(fpOthersRead):
@@ -107,7 +107,7 @@ proc handleFileRequest(
   let pathDir = path.splitFile.dir / ""
 
   if pathDir.startsWith(publicUrl):
-    if existsDir(path):
+    if dirExists(path):
       status = await sendStaticIfExists(
         req,
         @[path / "index.html", path / "index.htm"]
@@ -167,4 +167,4 @@ proc serveStatic*() =
   waitFor server.serve(Port(8080), cb)
 
 when isMainModule:
-  serveStatic()
+  serveStatic()