Update numpy requirement for Python 3.4

Author: molinav

packages/basemap/requirements.txt

@@ -6,7 +6,7 @@ numpy >= 1.11, < 1.12; python_version == "2.6"
 numpy >= 1.16, < 1.17; python_version == "2.7"
 numpy >= 1.11, < 1.12; python_version == "3.2"
 numpy >= 1.11, < 1.12; python_version == "3.3"
-numpy >= 1.11, < 1.17; python_version == "3.4"
+numpy >= 1.15, < 1.17; python_version == "3.4"
 numpy >= 1.16, < 1.19; python_version == "3.5"
 numpy >= 1.16, < 1.20; python_version == "3.6"
 numpy >= 1.21, < 1.23; python_version >= "3.7"