Merge pull request #37 from ConvertAPI/update-content-type

Set content-type

Author: kmozsi

src/main/java/com/convertapi/client/ConvertApi.java

@@ -71,6 +71,7 @@ public static CompletableFuture<ConversionResult> convert(String fromFormat, Str
             Request request = Http.getRequestBuilder()
                 .url(url)
                 .addHeader("Accept", "application/json")
+                .addHeader("Content-Type", "multipart/form-data")
                 .post(multipartBuilder.build())
                 .build();
 

src/main/java/com/convertapi/client/Http.java

@@ -66,6 +66,7 @@ static CompletableFuture<Void> requestDelete(String url) {
             } catch (IOException e) {
                 throw new RuntimeException(e);
             }
+            return null;
         });
     }