chore(liquibase-maven-plugin): disable SSL when connecting to MySQL.

Fixes the following error:

$ ./mvnw liquibase:updateSQL
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------< ru.mystamps:mystamps >------------------------
[INFO] Building My Stamps 0.4.3-SNAPSHOT
[INFO] --------------------------------[ war ]---------------------------------
[INFO]
[INFO] --- liquibase-maven-plugin:3.5.5:updateSQL (default-cli) @ mystamps ---
[INFO] ------------------------------------------------------------------------
[INFO] Parsing Liquibase Properties File
[INFO]   File: /Users/coder/git/mystamps/src/main/resources/liquibase/liquibase.properties
[INFO] ------------------------------------------------------------------------
Sat Mar 07 20:10:33 GMT 2020 WARN: Establishing SSL connection without server's identity
verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL
connection must be established by default if explicit option isn't set. For compliance with existing
applications not using SSL the verifyServerCertificate property is set to 'false'. You need either
to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for
server certificate verification.

[skip ci]

Author: php-coder

src/main/resources/liquibase/liquibase.properties

@@ -1,4 +1,4 @@
 driver = com.mysql.jdbc.Driver
-url = jdbc:mysql://localhost:3306/mystamps?characterEncoding=UTF-8
+url = jdbc:mysql://localhost:3306/mystamps?characterEncoding=UTF-8&useSSL=false
 username = mystamps
 password = mystamps