Bump version to v3.0.0-alpha-2

This commit prepares the repository for the v3.0.0-alpha-2 releases and
updates many of the manifest files.

Changelist:
- Update Python version in setup.cfg
- Update version and dependency versions in setup-nightly.py
- Add alpha releases to SECURITY.md and update codefactor.io to
  DeepSource
- Update DeepSource Python runtime

.deepsource.toml

@@ -16,4 +16,4 @@ name = "python"
 enabled = true
 
   [analyzers.meta]
-  runtime_version = "3.x.x"
+  runtime_version = "3.9.6"

SECURITY.md

@@ -1,23 +1,24 @@
 # Security Policy
 
 ## Supported Versions
+
 The following versions will receive regular security updates:
 
 | Version | Supported          |
 | ------- | ------------------ |
 | master-latest   | ✔️ |
 | master-2.x.x   | ✔️ |
+| nightly-alpha-latest   | ✔️ |
 | nightly-latest   | ✔️ |
 | master < 2.0   | :x: |
 | nightly < latest   | :x: |
 
 ## Reporting a Vulnerability
 
-The epispot team works as hard as possible to keep code clear of any vulnerabilities. 
-Our steps include extensive CodeQL analysis, third-party open-source code analysis from tools like codefactor.io, and heavy unit testing.
-However, vulnerabilities will inevitably arise. If you see or suspect a vulnerability, epispot will fix it as fast as possible.
+The epispot team works as hard as possible to keep code clear of any vulnerabilities. Our steps include extensive CodeQL analysis, third-party open-source code analysis from tools like DeepSource, and heavy unit testing. However, vulnerabilities will inevitably arise. If you see or suspect a vulnerability, epispot will fix it as fast as possible.
 
 ### Here's what to do if you've found a vulnerability:
+
 1. Open an issue and **@mention** a maintainer
 2. Title the issue "VULNERABILITY" but do not describe the vulnerability in the issue itself
 3. You will receive further instructions after completing (2)

setup-nightly.py

@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="epispot-nightly",
-    version="3.0.0-alpha-1",
+    version="3.0.0-alpha-2",
     author="quantum9innovation",
     description="The nightly version of the epispot package.",
     long_description=long_description,
@@ -31,5 +31,11 @@
         "Topic :: Scientific/Engineering",
     ],
     python_requires='>=3.7',
-    install_requires=['matplotlib', 'numpy', 'fire', 'plotly'],
+    install_requires=[
+        'matplotlib~=3.4.2', 
+        'numpy~=1.21.1', 
+        'fire~=0.4.0', 
+        'plotly~=5.1.0',
+        'SciencePlots~=1.0.8'
+    ],
 )

setup.cfg

@@ -23,7 +23,7 @@ classifiers =
 package_dir =
     = epispot
 packages = find:
-python_requires = >=3.6
+python_requires = >=3.7
 
 [options.packages.find]
 where = epispot