Bump 0.4.0

[kmcbride]

• Remove strong connectable<->loop reference #169 Removed strong connectable↔︎loop reference
• Handle #file/#filePath distinction in Swift 5.3 #167 Handled #file/#filePath distinction for Swift 5.3
• Address exclusionary language #165 Addressed exclusionary language
• Visual model diffing in MobiusTest #164 Added visual model diff to test expectation output
• Use latest-and-greatest Xcode #163 Updated CI to Xcode 11.4.1
• Disable caching for SPM build #162 Disabled caching for CI SPM build
• Connectable class is no longer abstract #161 Replaced abstract ConnectableClass implementations
• Don't discourage dispatchEvent #158 Updated doc comments
• Proposal: Add ability to specify execution queue in EffectRouter #155, Add label to .on(queue:) #157 Added ability to specify execution queue for effect handlers
• Misc. cleanup #154 Cleaned up APIs and implementations
• Fix and simplify logging adaptors #153 Fixed and simplified logging adaptors
• Simplify MobiusLoop implementation #151 Simplified MobiusLoop implementation
• Add Connectable.map to MobiusExtras #150 Added Connectable.map helper for output transformation
• Add beginnerLoop and test wiki tutorial #149 Added Mobius.beginnerLoop helper and tests for the Getting Started tutorial
• Remove outdated MobiusTest playground #148 Removed MobiusTest playground
• Remove redundant explicit generic arguments #147 Removed unnecessary generic arguments
• Remove Initiate completely from MobiusLoop #146 Removed initiate from Mobius.Builder
• Remove all the deprecated stuff #145, Remove deprecated-in-0.3 types #166 Removed deprecations introduced in 0.3.0

[codecov]

Codecov Report

Merging #170 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #170   +/-   ##
=======================================
  Coverage   94.36%   94.36%           
=======================================
  Files          43       43           
  Lines        1278     1278           
=======================================
  Hits         1206     1206           
  Misses         72       72           

Flag	Coverage Δ
ios	94.36% <ø> (ø)
macspm	94.31% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update cf6ee89...97e3110. Read the comment docs.

[kmcbride]

@JensAyton does this look correct?