fix cleanpull()

[cserteGT3]

In short:
old:

julia>  print(rpad("→ Retrieving updates from the repository..."), 35)
ERROR: MethodError: no method matching rpad(::String)
Closest candidates are:
  rpad(::Union{AbstractChar, AbstractString}, ::Integer) at strings/util.jl:269
  rpad(::Union{AbstractChar, AbstractString}, ::Integer, ::Union{AbstractChar, AbstractString}) at strings/util.jl:269
  rpad(::Any, ::Integer) at strings/util.jl:262
  ...
Stacktrace:
 [1] top-level scope at none:0

Fix:

julia>  print(rpad("→ Retrieving updates from the repository...", 35))
→ Retrieving updates from the repository...

[codecov]

Codecov Report

Merging #181 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #181   +/-   ##
=======================================
  Coverage   88.18%   88.18%           
=======================================
  Files          25       25           
  Lines        1007     1007           
=======================================
  Hits          888      888           
  Misses        119      119

Impacted Files	Coverage Δ
src/manager/post_processing.jl	28.57% <0%> (ø)	⬆️

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[tlienart]

Great, thanks!