Remove webp conversion

go.mod

@@ -4,15 +4,12 @@ go 1.14
 
 require (
 	github.com/Rhymen/go-whatsapp v0.1.0
-	github.com/chai2010/webp v1.1.0
 	github.com/gorilla/websocket v1.4.2
 	github.com/lib/pq v1.7.0
 	github.com/mattn/go-sqlite3 v1.14.0
-	github.com/pkg/errors v0.8.1
 	github.com/prometheus/client_golang v1.7.0
 	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
 	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
-	golang.org/x/image v0.0.0-20200618115811-c13761719519
 	gopkg.in/yaml.v2 v2.3.0
 	maunium.net/go/mauflag v1.0.0
 	maunium.net/go/maulogger/v2 v2.1.1