No need to call Pkg.update() before you add a package

[navidcy]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Docs: update installation instructions.

• What is the current behavior? (You can also link to an open issue here)

Docs suggest that one needs to update all packages before adding QuantumESPRESSOBase

• What is the new behavior (if this is a feature change)?

Drops the Pkg.update().

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

Nope

• Other information:

[codecov]

Codecov Report

Merging #167 (bb36eed) into master (1699f6b) will decrease coverage by 1.21%.
The diff coverage is n/a.

❗ Current head bb36eed differs from pull request most recent head 29196f9. Consider uploading reports for the commit 29196f9 to get more accurate results

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
- Coverage   29.89%   28.67%   -1.22%     
==========================================
  Files          15       13       -2     
  Lines         562      558       -4     
==========================================
- Hits          168      160       -8     
- Misses        394      398       +4     

Impacted Files	Coverage Δ
src/Inputs/PWscf/input.jl	70.83% <0.00%> (-8.34%)	⬇️
src/Inputs/Inputs.jl	30.00% <0.00%> (-6.37%)	⬇️
src/Inputs/PWscf/namelists.jl	81.25% <0.00%> (-1.79%)	⬇️
src/Inputs/PHonon/PHonon.jl	100.00% <0.00%> (ø)
src/Inputs/PWscf/PWscf.jl
src/QuantumESPRESSOBase.jl

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[singularitti]

Thanks @navidcy!