Add help in config file; bump readme instructions

Author: Philipp Heckel

README.md

@@ -174,14 +174,14 @@ sudo apt install replbot
 **Debian/Ubuntu** (*manual install*)**:**
 ```bash
 sudo apt install tmux
-wget https://github.com/binwiederhier/replbot/releases/download/v0.4.2/replbot_0.4.2_amd64.deb
-dpkg -i replbot_0.4.2_amd64.deb
+wget https://github.com/binwiederhier/replbot/releases/download/v0.4.5/replbot_0.4.5_amd64.deb
+dpkg -i replbot_0.4.5_amd64.deb
 ```
 
 **Fedora/RHEL/CentOS:**
 ```bash
 # Make sure that "tmux" is installed
-rpm -ivh https://github.com/binwiederhier/replbot/releases/download/v0.4.2/replbot_0.4.2_amd64.rpm
+rpm -ivh https://github.com/binwiederhier/replbot/releases/download/v0.4.5/replbot_0.4.5_amd64.rpm
 ```
 
 **Docker:**   
@@ -206,8 +206,8 @@ go get -u heckel.io/replbot
 **Manual install** (*any x86_64-based Linux*)**:**
 ```bash
 # Make sure that "tmux" is installed
-wget https://github.com/binwiederhier/replbot/releases/download/v0.4.2/replbot_0.4.2_linux_x86_64.tar.gz
-sudo tar -C /usr/bin -zxf replbot_0.4.2_linux_x86_64.tar.gz replbot
+wget https://github.com/binwiederhier/replbot/releases/download/v0.4.5/replbot_0.4.5_linux_x86_64.tar.gz
+sudo tar -C /usr/bin -zxf replbot_0.4.5_linux_x86_64.tar.gz replbot
 ```
 
 ## Building

config/config.yml

@@ -102,7 +102,20 @@ bot-token: MUST_BE_SET
 #
 # idle-timeout: 10m
 
+# Defines the maximum number of active sessions by all users combined.
+#
+# Format:    <number>
+# Default:   6
+# Required:  No
+#
 # max-total-sessions: 6
+
+# Defines the maximum number of active sessions by any individual user.
+#
+# Format:    <number>
+# Default:   2
+# Required:  No
+#
 # max-user-sessions: 2
 
 # Cursor setting for the terminal. Can be "on" to always render the cursor, "off" to turn it off entirely,