fix(http): add correct return types for downloadFile and uploadFile

closes: #2615

src/@ionic-native/plugins/http/index.ts

@@ -74,7 +74,7 @@ export class HTTP extends IonicNativePlugin {
  * This returns an object representing a basic HTTP Authorization header of the form.
  * @param username {string} Username
  * @param password {string} Password
- * @returns {Object} an object representing a basic HTTP Authorization header of the form {'Authorization': 'Basic base64encodedusernameandpassword'}
+ * @returns {Object} an object representing a basic HTTP Authorization header of the form {'Authorization': 'Basic base64EncodedUsernameAndPassword'}
  */
  @Cordova({ sync: true })
  getBasicAuthHeader(
@@ -283,7 +283,7 @@ export class HTTP extends IonicNativePlugin {
  * @param headers {Object} The headers to set for this request
  * @param filePath {string} The local path of the file to upload
  * @param name {string} The name of the parameter to pass the file along as
- * @returns {Promise<HTTPResponse>} returns a promise that resolve on success, and reject on failure
+ * @returns {Promise<FileEntry>} returns a promise that resolve on success, and reject on failure
  */
  @Cordova()
  uploadFile(
@@ -292,7 +292,7 @@ export class HTTP extends IonicNativePlugin {
  headers: any,
  filePath: string,
  name: string
- ): Promise<HTTPResponse> {
+ ): Promise<FileEntry> {
  return;
  }
 
@@ -301,16 +301,16 @@ export class HTTP extends IonicNativePlugin {
  * @param url {string} The url to send the request to
  * @param body {Object} The body of the request
  * @param headers {Object} The headers to set for this request
- * @param filePath {string} The path to donwload the file to, including the file name.
- * @returns {Promise<HTTPResponse>} returns a promise that resolve on success, and reject on failure
+ * @param filePath {string} The path to download the file to, including the file name.
+ * @returns {Promise<FileEntry>} returns a promise that resolve on success, and reject on failure
  */
  @Cordova()
  downloadFile(
  url: string,
  body: any,
  headers: any,
  filePath: string
- ): Promise<HTTPResponse> {
+ ): Promise<FileEntry> {
  return;
  }
 }