Add xdelta3 to required package list for testing
## TLDR
-This works on Ubuntu 19.10:
+This works on Ubuntu 20.04:
```sh
-sudo apt-get install build-essential autoconf pkg-config libtool mtools unzip zip help2man libconfuse-dev libarchive-dev
+sudo apt-get install build-essential autoconf pkg-config libtool mtools unzip zip help2man libconfuse-dev libarchive-dev xdelta3
./configure
make -j4
+make check
sudo make install
```
@@ -36,7 +37,7 @@ At least the following are required for building and running the regression
tests:
```sh
-sudo apt-get install build-essential autoconf pkg-config libtool mtools unzip zip help2man
+sudo apt-get install build-essential autoconf pkg-config libtool mtools unzip zip help2man xdelta3
```
## Static build
