ReplaceDocuments does an Update (PATCH) instead of a Replace (PUT)

[Kafkalasch]

When trying to replace documents (note the plural, it does work with ReplaceDocument correctly), the v2 version of the arangodriver has a bug and does an Update (that merges changes) instead of a replace.

You can see the error in collection_documents_replace_impl.go in line 100:

func (c collectionDocumentReplace) ReplaceDocumentsWithOptions(ctx context.Context, documents interface{}, opts *CollectionDocumentReplaceOptions) (CollectionDocumentReplaceResponseReader, error) {
// ...
req, err := c.collection.connection().NewRequest(http.MethodPatch, url) // <-- THIS SHOULD BE A http.MethodPut
// ...

[Kafkalasch]

Here is the fix: #645

Seems like I need to sign something. Feels like a hassle just for a single line of code change.

Please feel free to fix it yourself