Improve wget update command

[chetanmeh]

Improves the changes done in #3715 by adding space after wget. It also removed unused build.sh which was a leftover post #3613

Related issue and scope

• I opened an issue to propose and discuss this change (#????)

My changes affect the following components

• API
• Controller
• Message Bus (e.g., Kafka)
• Loadbalancer
• Invoker
• Intrinsic actions (e.g., sequences, conductors)
• Data stores (e.g., CouchDB)
• Tests
• Deployment
• CLI
• General tooling
• Documentation

Types of changes

• Bug fix (generally a non-breaking change which closes an issue).
• Enhancement or new feature (adds new functionality).
• Breaking change (a bug fix or enhancement which changes existing behavior).

Checklist:

• I signed an Apache CLA.
• I reviewed the style guides and followed the recommendations (Travis CI will check :).
• I added tests to cover my changes.
• My changes require further changes to the documentation.
• I updated the documentation where necessary.

[codecov-io]

Codecov Report

Merging #3723 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3723   +/-   ##
=======================================
  Coverage   75.05%   75.05%           
=======================================
  Files         127      127           
  Lines        6041     6041           
  Branches      391      391           
=======================================
  Hits         4534     4534           
  Misses       1507     1507

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