Remove any dependency on $GOPATH

Previously, we were running a small q.sh script at
$GOPATH/src/github.com/y0ssar1an/q/q.sh. With Go 1.12, $GOPATH is no longer a
requirement. We can't count on q.sh being at that path. This change just takes
the code that was in q.sh and moves it to the qq() function shown in the
README. Users should update their shell configs.

README.md

@@ -43,9 +43,19 @@ tailing `$TMPDIR/q`.
 ```sh
 qq() {
     clear
-    local gpath="${GOPATH:-$HOME/go}"
-    "${gpath%%:*}/src/github.com/y0ssar1an/q/q.sh" "$@"
+
+    logpath="$TMPDIR/q"
+    if [[ -z "$TMPDIR" ]]; then
+        logpath="/tmp/q"
+    fi
+
+    if [[ ! -f "$logpath" ]]; then
+        echo 'Q LOG' > "$logpath"
+    fi
+
+    tail -100f -- "$logpath"
 }
+
 rmqq() {
     if [[ -f "$TMPDIR/q" ]]; then
         rm "$TMPDIR/q"