Update transfer learning tutorial (#387)

* Update transfer learning tutorial

* Small changes

* Remove @epochs and add relu activation

* Update README.md

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Co-authored-by: Michael Abbott <[email protected]>

Author: christiangnrd

README.md

@@ -94,7 +94,7 @@ Flux v0.13 is the latest right now, marked with ☀️; models upgraded to use
 **Tutorials**
 * [A 60 Minute Blitz](tutorials/60-minute-blitz/60-minute-blitz.jl) ⛅️ v0.11
 * [DataLoader example with image data](tutorials/dataloader) ⛅️ v0.11
-* [Transfer Learning](tutorials/transfer_learning/transfer_learning.jl) ⛅️ v0.11
+* [Transfer Learning](tutorials/transfer_learning/transfer_learning.jl) ☀️ v0.13
 
 ## Examples Elsewhere