Correct reference to qls file (#22)

Fixes "A fatal error occurred: qlpack.qps.qls is not a well-known query suite." when using the example

Author: elgohr

README.md

@@ -98,13 +98,14 @@ to analyze and get a SARIF result file, you will have to run:
 
 ```
 # create the codeql db
-$ docker run --rm --name codeql-container -v /dir/to/analyze:/opt/src -v /dir/for/results:/opt/results -e CODEQL_CLI_ARGS="database create --language=python /opt/results/source_db -s /opt/src" mcr.microsoft.com/cstsectools/codeql-container
+$ export language="python"
+$ docker run --rm --name codeql-container -v /dir/to/analyze:/opt/src -v /dir/for/results:/opt/results -e CODEQL_CLI_ARGS="database create --language=${language} /opt/results/source_db -s /opt/src" mcr.microsoft.com/cstsectools/codeql-container
 
 # upgrade the db if necessary
 $ docker run --rm --name codeql-container -v /dir/to/analyze:/opt/src -v /dir/for/results:/opt/results -e CODEQL_CLI_ARGS=" database upgrade /opt/results/source_db" mcr.microsoft.com/cstsectools/codeql-container
 
 # run the queries in the qlpack
-$ docker run --rm --name codeql-container -v /dir/to/analyze:/opt/src -v /dir/for/results:/opt/results -e CODEQL_CLI_ARGS="database analyze --format=sarifv2 --output=/opt/results/issues.sarif /opt/results/source_db qlpack.qps" mcr.microsoft.com/cstsectools/codeql-container
+$ docker run --rm --name codeql-container -v /dir/to/analyze:/opt/src -v /dir/for/results:/opt/results -e CODEQL_CLI_ARGS="database analyze --format=sarifv2 --output=/opt/results/issues.sarif /opt/results/source_db ${language}-security-and-quality.qls" mcr.microsoft.com/cstsectools/codeql-container
 ```
 
 For more information on CodeQL and QL packs, please visit https://www.github.com/github/codeql.