Hotfix: Testnet burn rate (#272)

### Description
<!-- Describe what change this PR is implementing -->
Use `from_parts` instead of `from_percent`

### Types of Changes
<!--- What types of changes does your code introduce? -->
- [ ] Tech Debt (Code improvements)
- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Dependency upgrade (A change in substrate or any 3rd party crate
version)

### Migrations and Hooks
<!--- Check the following box with an x if the following applies: -->
- [ ] This change requires a runtime migration.
- [ ] Modifies `on_initialize`
- [ ] Modifies `on_finalize`

### Checklist
<!--- All boxes need to be checked. Follow this checklist before
requiring PR review -->
- [ ] Change has been tested locally.
- [ ] Change adds / updates tests.
- [ ] Changelog doc updated.

runtime/cere/src/lib.rs

@@ -125,7 +125,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	// and set impl_version to 0. If only runtime
 	// implementation changes and behavior does not, then leave spec_version as
 	// is and increment impl_version.
-	spec_version: 48800,
+	spec_version: 48801,
 	impl_version: 0,
 	apis: RUNTIME_API_VERSIONS,
 	transaction_version: 13,
@@ -904,7 +904,7 @@ parameter_types! {
 	pub const ProposalBond: Permill = Permill::from_percent(5);
 	pub const ProposalBondMinimum: Balance = 50_000 * DOLLARS;
 	pub const SpendPeriod: BlockNumber = DAYS;
-	pub const Burn: Permill = Permill::from_percent(580);
+	pub const Burn: Permill = Permill::from_parts(580);
 	pub const TipCountdown: BlockNumber = DAYS;
 	pub const TipFindersFee: Percent = Percent::from_percent(20);
 	pub const TipReportDepositBase: Balance = 50_000 * DOLLARS;