doc: update jupyter kernels config location

old Jupyter version was expecting user configuration to live under: $HOME/.ipython/kernels/<kernel-name> now, it shall be under: $HOME/.local/share/jupyter/kernels/<kernel-name> If one would use the old location, jupyter would migrate the configuration to $HOME/.local/share/jupyter and leave the old one stale (and subsequent modifications to the file(s) under $HOME/.ipython would be ignored.) Update the README.

Author: sbinet

README.md

@@ -75,13 +75,13 @@ This project came out of the [Gopher Gala](http://gophergala.com/) 2016. It is
 - Create a directory for the new kernel config:
 
  ```
- mkdir -p ~/.ipython/kernels/gophernotes
+ mkdir -p ~/.local/share/jupyter/kernels/gophernotes
  ```
 
-- Copy the kernel config into the `.ipython` directory:
+- Copy the kernel config into the `jupyter` directory:
 
  ```
- cp -r $GOPATH/src/github.com/gophergala2016/gophernotes/kernel/* ~/.ipython/kernels/gophernotes
+ cp -r $GOPATH/src/github.com/gophergala2016/gophernotes/kernel/* ~/.local/share/jupyter/kernels/gophernotes
  ```
 
 ### Local, OSX
@@ -132,11 +132,11 @@ This project came out of the [Gopher Gala](http://gophergala.com/) 2016. It is
 - Copy the kernel config:
 
  ```
- mkdir -p ~/.ipython/kernels/gophernotes
- cp -r $GOPATH/src/github.com/gophergala2016/gophernotes/kernel/* ~/.ipython/kernels/gophernotes
+ mkdir -p ~/.local/share/jupyter/kernels/gophernotes
+ cp -r $GOPATH/src/github.com/gophergala2016/gophernotes/kernel/* ~/.local/share/jupyter/kernels/gophernotes
  ```
 
-- Update `~/.ipython/kernels/gophernotes/kernel.json` with the path to your $GOPATH installation. If you used the path above, your file will look like:
+- Update `~/.local/share/jupyter/kernels/gophernotes/kernel.json` with the path to your $GOPATH installation. If you used the path above, your file will look like:
 
  ```
  {
@@ -166,7 +166,7 @@ This project came out of the [Gopher Gala](http://gophergala.com/) 2016. It is
 ## Troubleshooting
 
 ### gophernotes not found
-- Depending on your environment, you may need to manually change the path to the `gophernotes` executable in `kernel/kernel.json` before copying it to `~/.ipython/kernels/gophernotes`. You can put the **full path** to the `gophernotes` executable here, and you shouldn't have any further issues.
+- Depending on your environment, you may need to manually change the path to the `gophernotes` executable in `kernel/kernel.json` before copying it to `~/.local/share/jupyter/kernels/gophernotes`. You can put the **full path** to the `gophernotes` executable here, and you shouldn't have any further issues.
 
 
 ### "Kernel error" in a running notebook