README: Sort variables alphabetically

Also make linebreaks consistent

Author: julienschmidt

README.md

@@ -221,6 +221,14 @@ Note that this sets the location for time.Time values but does not change MySQL'
 
 Please keep in mind, that param values must be [url.QueryEscape](http://golang.org/pkg/net/url/#QueryEscape)'ed. Alternatively you can manually replace the `/` with `%2F`. For example `US/Pacific` would be `loc=US%2FPacific`.
 
+##### `maxAllowedPacket`
+```
+Type:          decimal number
+Default:       0
+```
+
+Max packet size allowed in bytes. Use `maxAllowedPacket=0` to automatically fetch the `max_allowed_packet` variable from server.
+
 ##### `multiStatements`
 
 ```
@@ -233,7 +241,6 @@ Allow multiple statements in one query. While this allows batch queries, it also
 
 When `multiStatements` is used, `?` parameters must only be used in the first statement.
 
-
 ##### `parseTime`
 
 ```
@@ -254,7 +261,6 @@ Default:        0
 
 I/O read timeout. The value must be a decimal number with an unit suffix ( *"ms"*, *"s"*, *"m"*, *"h"* ), such as *"30s"*, *"0.5m"* or *"1m30s"*.
 
-
 ##### `strict`
 
 ```
@@ -269,7 +275,6 @@ A server-side strict mode, which is safe for production use, can be set via the
 
 By default MySQL also treats notes as warnings. Use [`sql_notes=false`](http://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_sql_notes) to ignore notes.
 
-
 ##### `timeout`
 
 ```
@@ -279,7 +284,6 @@ Default:        OS default
 
 *Driver* side connection timeout. The value must be a decimal number with an unit suffix ( *"ms"*, *"s"*, *"m"*, *"h"* ), such as *"30s"*, *"0.5m"* or *"1m30s"*. To set a server side timeout, use the parameter [`wait_timeout`](http://dev.mysql.com/doc/refman/5.6/en/server-system-variables.html#sysvar_wait_timeout).
 
-
 ##### `tls`
 
 ```
@@ -290,7 +294,6 @@ Default:        false
 
 `tls=true` enables TLS / SSL encrypted connection to the server. Use `skip-verify` if you want to use a self-signed or invalid certificate (server side). Use a custom value registered with [`mysql.RegisterTLSConfig`](http://godoc.org/github.com/go-sql-driver/mysql#RegisterTLSConfig).
 
-
 ##### `writeTimeout`
 
 ```
@@ -301,15 +304,6 @@ Default:        0
 I/O write timeout. The value must be a decimal number with an unit suffix ( *"ms"*, *"s"*, *"m"*, *"h"* ), such as *"30s"*, *"0.5m"* or *"1m30s"*.
 
 
-##### `maxAllowedPacket`
-```
-Type:          decimal number
-Default:       0
-```
-
-Max packet size allowed in bytes. Use `maxAllowedPacket=0` to automatically fetch the `max_allowed_packet` variable from server.
-
-
 ##### System Variables
 
 All other parameters are interpreted as system variables: