update versioning instructions in pull request template (#614)

we should precisely pin dependencies before 1, not use approximate pins

.github/pull_request_template.md

@@ -4,7 +4,7 @@
 
 ### Type of Change
 
-- [ ] New Example
+- [ ] New example
 - [ ] Example updates (Bug fixes, new features, etc.)
 - [ ] Other (changes to the codebase, but not to examples)
 
@@ -13,7 +13,7 @@
 - [ ] Example is testable in synthetic monitoring system, or `lambda-test: false` is added to example frontmatter
 - [ ] Example does _not_ require third-party dependencies to be installed locally
 - [ ] Example pins all dependencies
-- [ ] Example dependencies with `version < 1` are pinned to minor version, `~=0.x.y`
+- [ ] Example dependencies with `version < 1` are pinned to minor version, `==0.x.y`
 - [ ] Example specifies a `python_version` for the base image
 - [ ] Example is documented with comments throughout, in a [_Literate Programming_](https://en.wikipedia.org/wiki/Literate_programming) style.