Remove extra markdown from Readme and specs

Readme.md

@@ -335,12 +335,7 @@ TIPS
    e.g. `config.cache_store = ..., namespace: "test_#{ENV['TEST_ENV_NUMBER']}"`
  - Debug errors that only happen with multiple files using `--verbose` and [cleanser](https://github.com/grosser/cleanser)
  - `export PARALLEL_TEST_PROCESSORS=13` to override default processor count
- - `export ## 4.20.0 - 2025-02-28
-
-### Added
-
-PARALLEL_TEST_MULTIPLY_PROCESSES
-=.5` to override default processor multiplier
+ - `export PARALLEL_TEST_MULTIPLY_PROCESSES=.5` to override default processor multiplier
  - Shell alias: `alias prspec='parallel_rspec -m 2 --'`
  - [Spring] Add the [spring-commands-parallel-tests](https://github.com/DocSpring/spring-commands-parallel-tests) gem to your `Gemfile` to get `parallel_tests` working with Spring.
  - `--first-is-1` will make the first environment be `1`, so you can test while running your full suite.<br/>

spec/parallel_tests_spec.rb

@@ -41,6 +41,10 @@ def call(count)
       allow(Parallel).to receive(:multiple).and_return(default_multiple)
     end
 
+    after do
+      ENV.delete('PARALLEL_TEST_MULTIPLY_PROCESSES')
+    end
+
     def call(multiple)
       ParallelTests.determine_multiple(multiple)
     end
@@ -54,26 +58,16 @@ def call(multiple)
     end
 
     it "uses the processor multiple from ENV before Parallel" do
-      ENV['## 4.20.0 - 2025-02-28
-
-### Added
-
-PARALLEL_TEST_MULTIPLY_PROCESSES
-'] = '0.75'
-      expect(call(nil)).to eq(1)
+      ENV['PARALLEL_TEST_MULTIPLY_PROCESSES'] = '0.75'
+      expect(call(nil)).to eq(0.75)
     end
 
     it "does not use blank multiple" do
       expect(call('   ')).to eq(default_multiple)
     end
 
     it "does not use blank env" do
-      ENV['## 4.20.0 - 2025-02-28
-
-### Added
-
-PARALLEL_TEST_MULTIPLY_PROCESSES
-'] = '   '
+      ENV['PARALLEL_TEST_MULTIPLY_PROCESSES'] = '   '
       expect(call(nil)).to eq(default_multiple)
     end
   end