maintain clean output of main run.sh script

[jangorecki]

WARNING: You are using pip version 20.0.2; however, version 20.1 is available.
You should consider upgrading via the '/home/jan/git/db-benchmark/dask/py-dask/bin/python -m pip install --upgrade pip' command.
   Updating registry at `~/.julia/registries/General`
   Updating git-repo `https://github.com/JuliaRegistries/General.git`
  Installed Parsers ─ v1.0.4
  Installed Compat ── v3.10.0
   Updating `~/.julia/environments/v1.4/Project.toml`
 [no changes]
   Updating `~/.julia/environments/v1.4/Manifest.toml`
  [34da2185] ↑ Compat v3.9.1 ⇒ v3.10.0
  [69de0a69] ↑ Parsers v1.0.3 ⇒ v1.0.4
WARNING: You are using pip version 20.0.2; however, version 20.1 is available.
You should consider upgrading via the '/home/jan/git/db-benchmark/pandas/py-pandas/bin/python -m pip install --upgrade pip' command.
WARNING: You are using pip version 20.0.2; however, version 20.1 is available.
You should consider upgrading via the '/home/jan/git/db-benchmark/spark/py-spark/bin/python -m pip install --upgrade pip' command.

we don't want this in run.sh output