[BUG] Confusing settings in Readme.

[loveFluffy]

In the Readme file:

Command hooks exist in the format: {hook_name}

{presave}: executes _before a session is saved
{saveextra}: execute _after a session is saved, return string will save to *x.vim, reference :help mks
{postsave}: executes _after a session is saved
{prerestore}: executs _before a session is restored
{postrestore}: executs _after a session is restored
{predelete}: executs _before a session is deleted
{postdelete}: executs _after a session is deleted

For example, {presave} should be literally be {pre_save}. This is so confusing. I tried to set like this:
presave_cmds={"NERDTreeClose"}
this actually won't work and give zero error message... and it should be:
pre_save_cmds={"NERDTreeClose"}

================ Please Correct Those {hook_name}s by Adding a "_" For Each of Them ===========================

Finally I figured out by:

1. open a file;
2. opening NERDTree;
3. run :SessionSave;
   then I found the NERDTree is still open. It has be known that the NERDTree won't be saved by auto-session. If you keep it on before :SessionSave, you will get errors when you try to :SessionRestore since auto-session can't restore the NERDTree. ( see details here: File tree integration with nvim-tree and NERDTree #179) So, it's kind important to automatically close NERDTree before :SessionSave to avoid those annoying error messages.

[loveFluffy]

I don't know why, but the tiagofumo/vim-verdtree-syntax-highlight seems don't get along well with auto-session. It will cause errors too at :SessionRestore, I simply keep it away while using auto-session.
Just leave this message in case someone else need.