Update install.sh

Fix script

Author: pytlesk4

install.sh

@@ -28,9 +28,6 @@ fi
 LATEST=$(curl -s https://api.github.com/repos/stoplightio/prism/tags | grep -Eo '"name":.*?[^\\]",'  | head -n 1 | sed 's/[," ]//g' | cut -d ':' -f 2)
 URL="https://github.com/stoplightio/prism/releases/download/$LATEST/prism_$PLATFORM"
 DEST=/usr/local/bin/prism
-if [ "$GOPATH" != "" ] ; then
-  DEST=$GOPATH/bin/prism
-fi
 
 if [ -z $LATEST ] ; then
   echo "Error requesting. Download binary from ${URL}"