Update dependencies, version bump

pyproject.toml

 [tool.poetry]
 name = "icartt"
-version = "2.0.0-rc1"
+version = "2.0.0-rc.2"
 description = "ICARTT format reader and writer"
 license = "GPL-3.0-or-later"
 authors = ["Christoph Knote <christoph.knote@med.uni-augsburg.de>", "Florian Obersteiner <florian.obersteiner@kit.edu>"]
 readme = "README.md"
 homepage = "https://mbees.med.uni-augsburg.de/"
 repository = "https://mbees.med.uni-augsburg.de/gitlab/mbees/icartt_pypackage"
-documentation = "https://mbees.med.uni-augsburg.de/docs/icartt/"
+documentation = "https://mbees.med.uni-augsburg.de/docs/icartt/2.0.0-rc.2/"
 keywords = [ "atmosphere", "file format", "ames", "nasa" ]
 classifiers = [
-    "Programming Language :: Python :: 3",
     "Development Status :: 5 - Production/Stable",
     "Environment :: Console",
     "Intended Audience :: Developers",
     "Intended Audience :: Education",
     "Intended Audience :: End Users/Desktop",
     "Intended Audience :: Science/Research",
-    "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
     "Operating System :: POSIX",
     "Topic :: Education",
     "Topic :: Scientific/Engineering",
@@ -33,18 +31,19 @@ packages = [
 
 
 [tool.poetry.dependencies]
-python = ">=3.8,<4.0"
-numpy  = ">= 1.12"
+python = "^3.5"
+numpy  = ">= 1.17"
 
 
 [tool.poetry.dev-dependencies]
-pytest = "^5.2"
-coverage = ">= 6.3.2"
-sphinx = ">= 4.4"
-sphinx-rtd-theme = ">= 1.0"
-enum-tools = ">= 0.9"
-sphinx-toolbox = ">= 2.16.0"
-black = "^22.3.0"
+pytest = { version = "^5.2", python = ">=3.5" }
+coverage = { version = ">= 6.3.2", python = ">=3.7" }
+sphinx = { version = ">= 4.4", python = ">=3.6" }
+sphinx-rtd-theme = { version = ">= 1.0", python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*" }
+enum-tools = { version = ">=0.9", python = ">=3.6" }
+sphinx-toolbox = { version = ">= 2.16.0", python = ">=3.6.1" }
+black = { version = "^22.3.0", python = "^3.6.2" }
+numpy = { version = ">=1.22", python = ">=3.8" }
 
 
 [tool.black]