Fix warnings and Docker bug

Author: tdewolff

Dockerfile

@@ -1,7 +1,7 @@
 # Use this image to build the executable
 FROM golang:1.16-alpine AS compiler
 
-RUN apk add --no-cache git ca-certificates make
+RUN apk add --no-cache git ca-certificates make bash
 
 WORKDIR $GOPATH/src/minify
 COPY . .

js/util.go

@@ -29,11 +29,7 @@ var (
 	notBytes                   = []byte("!")
 	questionBytes              = []byte("?")
 	equalBytes                 = []byte("=")
-	notNotBytes                = []byte("!!")
-	andBytes                   = []byte("&&")
-	orBytes                    = []byte("||")
 	optChainBytes              = []byte("?.")
-	nullishBytes               = []byte("??")
 	arrowBytes                 = []byte("=>")
 	zeroBytes                  = []byte("0")
 	oneBytes                   = []byte("1")