Add curried apply to Fetch object

[AlecZorab]

very minor convenience, allows users to do

def getUser(id: UserId) = Fetch[User](id)

[codecov-io]

Codecov Report

Merging #109 into master will increase coverage by 0.19%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
+ Coverage   76.79%   76.98%   +0.19%     
==========================================
  Files          10       10              
  Lines         237      239       +2     
  Branches        2        2              
==========================================
+ Hits          182      184       +2     
  Misses         55       55

Impacted Files	Coverage Δ
shared/src/main/scala/fetch.scala	81.08% <100%> (+1.08%)	✅

---

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 b7ee4a1...6b4a11a. Read the comment docs.

[ghost]

Thanks!