Removed minor pinning

bob/devtools/bootstrap.py

@@ -448,7 +448,7 @@ if __name__ == "__main__":
                 ))
 
     conda_version = "4"
-    conda_build_version = "3.17"
+    conda_build_version = "3"
     conda_verify_version = "3"
 
     conda_verbosity = []

conda/meta.yaml

@@ -32,7 +32,7 @@ requirements:
     - click >=7
     - click-plugins
     - conda=4
-    - conda-build=3.17
+    - conda-build=3
     - conda-verify=3
     - certifi
     - docformatter