Update dev-requirements for new pip syntax and add package-lock.yaml (#870)

Author: gwenwindflower

dev-requirements.txt

@@ -1,9 +1,9 @@
 pytest
 pytest-dotenv
-git+https://github.com/dbt-labs/dbt-core.git#egg=dbt-core&subdirectory=core
-git+https://github.com/dbt-labs/dbt-core.git#egg=dbt-tests-adapter&subdirectory=tests/adapter
-git+https://github.com/dbt-labs/dbt-core.git#egg=dbt-postgres&subdirectory=plugins/postgres
-git+https://github.com/dbt-labs/dbt-redshift.git
-git+https://github.com/dbt-labs/dbt-snowflake.git
-git+https://github.com/dbt-labs/dbt-bigquery.git
+dbt-core@git+https://github.com/dbt-labs/dbt-core.git#subdirectory=core
+dbt-tests-adapter@git+https://github.com/dbt-labs/dbt-adapters.git#subdirectory=dbt-tests-adapter
+dbt-postgres@git+https://github.com/dbt-labs/dbt-postgres.git
+dbt-redshift@git+https://github.com/dbt-labs/dbt-redshift.git
+dbt-snowflake@git+https://github.com/dbt-labs/dbt-snowflake.git
+dbt-bigquery@git+https://github.com/dbt-labs/dbt-bigquery.git
 pytest-xdist

integration_tests/package-lock.yml

@@ -0,0 +1,3 @@
+packages:
+- local: ../
+sha1_hash: de2deba3d66ce03d8c02949013650cc9b94f6030