I want to write a Bash script to convert every `.pdf` file
in the current directory into a `.png` file.

For example:

```none
$ls .
a.pdf b.pdf

$./pdf2png.sh
Converting pdfs to pngs
a.pdf -> a.png
b.pdf -> b.png

```

This is my best attempt:

```bash
#!/bin/bash
convert -verbose -density 500 -resize '800' a.pdf a.png
convert -verbose -density 500 -resize '800' b.pdf b.png

```