Update 'README.md'

fixed spelling error

README.md

@@ -1,3 +1,3 @@
 # php7.2-odbc
 
-Dockerized php7.2-apache with ODBC support, build according to : https://www.microsoft.com/en-us/sql-server/developer-get-started/php/ubuntu/
+Dockerized php7.2-apache with ODBC support, built according to : https://www.microsoft.com/en-us/sql-server/developer-get-started/php/ubuntu/