[skip ci] Automatically update README.md

Author: mlocati

README.md

@@ -332,6 +332,7 @@ install-php-extensions @fix_letsencrypt
 | pdo_oci | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |  |  |
 | pdo_odbc | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | pdo_pgsql | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
+| pdo_snowflake[*](#special-requirements-for-pdo_snowflake) |  | ✓ | ✓ | ✓ | ✓ |  |  |  |  |  |  |  |  |
 | pdo_sqlsrv |  | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |  |  |
 | pgsql | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | phalcon |  | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |  |  |  |  |
@@ -404,7 +405,7 @@ install-php-extensions @fix_letsencrypt
 | zookeeper |  | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | zstd | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 
-*Number of supported extensions: 157*
+*Number of supported extensions: 158*
 <!-- END OF EXTENSIONS TABLE -->
 
 PS: the pre-installed PHP extensions are excluded from this list.
@@ -508,6 +509,7 @@ Some extensions have special requirements:
 | <a name="special-requirements-for-memprof"></a>memprof | &bull; Not available in `alpine3.9` docker images<br />&bull; Not available in `alpine3.10` docker images<br />&bull; Not available in `alpine3.11` docker images<br />&bull; Not available in `alpine3.12` docker images<br />&bull; Not available in `alpine3.13` docker images<br />&bull; Not available in `alpine3.14` docker images<br />&bull; Not available in `alpine3.15` docker images |
 | <a name="special-requirements-for-parallel"></a>parallel | Requires images with PHP compiled with thread-safety enabled (`zts`) |
 | <a name="special-requirements-for-parle"></a>parle | Not available in `jessie` docker images |
+| <a name="special-requirements-for-pdo_snowflake"></a>pdo_snowflake | &bull; Not available in `jessie` docker images<br />&bull; Not available in `stretch` docker images<br />&bull; Not available in `alpine` docker images |
 | <a name="special-requirements-for-phpy"></a>phpy | Not available in `buster` docker images |
 | <a name="special-requirements-for-pthreads"></a>pthreads | Requires images with PHP compiled with thread-safety enabled (`zts`) |
 | <a name="special-requirements-for-saxon"></a>saxon | &bull; Not available in `alpine3.7` docker images<br />&bull; Not available in `alpine3.8` docker images<br />&bull; Not available in `alpine3.9` docker images<br />&bull; Not available in `alpine3.10` docker images<br />&bull; Not available in `alpine3.11` docker images<br />&bull; Not available in `7.2-alpine` docker images<br />&bull; Not available in `7.3-alpine` docker images<br />&bull; Not available in `7.4-alpine` docker images |