Fix Manifest for GP prior example (#340)

* Fix Manifest for GP prior example

* Update instructions in README

* Update examples/README.md

Co-authored-by: st-- <st--@users.noreply.github.com>

Author: willtebbutt

examples/README.md

@@ -44,7 +44,8 @@ From a Julia REPL started in your example script's directory, you can run
 ```julia
 julia> ] activate .
 julia> ] add Literate
-julia> ] add KernelFunctions
+julia> # the following line adds a dependency on KernelFunctions that is based on the local directories, not a hash:
+julia> ] dev ../..
 julia> # add any other example-specific dependencies
 ```
 to generate the project files.

examples/gaussian-process-priors/Manifest.toml

@@ -281,9 +281,9 @@ version = "2.1.0+0"
 
 [[KernelFunctions]]
 deps = ["ChainRulesCore", "Compat", "CompositionsBase", "Distances", "FillArrays", "Functors", "LinearAlgebra", "Random", "Requires", "SpecialFunctions", "StatsBase", "StatsFuns", "TensorCore", "Test", "ZygoteRules"]
-git-tree-sha1 = "e8b5ba31b6d18695fd46bfcd8557682839023195"
+path = "../.."
 uuid = "ec8451be-7e33-11e9-00cf-bbf324bd1392"
-version = "0.10.6"
+version = "0.10.8"
 
 [[LAME_jll]]
 deps = ["Artifacts", "JLLWrappers", "Libdl", "Pkg"]