pycode-browser is broken on focal

[Norbert]

Steps to reproduce:
1. Install Ubuntu 20.04 LTS
2. Install `pycode-browser` package
3. Launch `pycode-browser`

Expected results:
* `pycode-browser` started normally

Actual results:
* `pycode-browser` does not start, shows the following in the terminal:

$ pycode-browser
/usr/bin/pycode-browser: 2: python: not found

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: pycode-browser 1:1.02+git20181006-5
ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
Uname: Linux 5.4.0-14-generic x86_64
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
CurrentDesktop: MATE
Date: Mon Feb 17 00:20:13 2020
InstallationDate: Installed on 2020-02-16 (0 days ago)
InstallationMedia: Ubuntu-MATE 20.04 LTS "Focal Fossa" - Alpha amd64 (20200216)
PackageArchitecture: all
SourcePackage: pycode-browser
UpgradeStatus: No upgrade log present (probably fresh install)

[Norbert (nrbrtx)]

Fixable by `sudo apt-get install python-is-python3` .