Remove install script from wasmer repo

[MarkMcCaskey]

We're hosting it at github.com/wasmerio/wasmer-install now

Review

• Add a short description of the the change to the CHANGELOG.md file

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@e5b3273). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1645   +/-   ##
=========================================
  Coverage          ?   31.72%           
=========================================
  Files             ?      185           
  Lines             ?    26999           
  Branches          ?        0           
=========================================
  Hits              ?     8566           
  Misses            ?    18433           
  Partials          ?        0           

Impacted Files	Coverage Δ
lib/engine-jit/src/link.rs	94.44% <0.00%> (ø)
lib/compiler/src/compiler.rs	31.25% <0.00%> (ø)
lib/deprecated/runtime/src/lib.rs	0.00% <0.00%> (ø)
lib/cli/src/common.rs	0.00% <0.00%> (ø)
lib/api/src/externals/function.rs	35.92% <0.00%> (ø)
lib/emscripten/src/bitwise.rs	0.00% <0.00%> (ø)
lib/api/src/native.rs	51.51% <0.00%> (ø)
lib/emscripten/src/exception.rs	0.00% <0.00%> (ø)
lib/vm/src/module.rs	41.25% <0.00%> (ø)
lib/engine-native/src/serialize.rs	0.00% <0.00%> (ø)
... and 175 more

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