bpo-40993: Don't run Travis CI coverage on PRs (GH-20916)

bpo-40993: Don't run Travis CI coverage on PRs (GH-20916) · python/cpython@fc710ee

Original file line number	Diff line number	Diff line change
`@@ -82,6 +82,12 @@ matrix:`
`82`	`82`	`packages:`
`83`	`83`	`- xvfb`
`84`	`84`	`before_script:`
	`85`	`+ - \|`
	`86`	`+ if [[ "$TRAVIS_PULL_REQUEST" != "false" ]]`
	`87`	`+ then`
	`88`	`+ echo "Don't run Python coverage on pull requests."`
	`89`	`+ exit`
	`90`	`+ fi`
`85`	`91`	`- ./configure`
`86`	`92`	`- make -j4`
`87`	`93`	`# Need a venv that can parse covered code.`
`@@ -109,6 +115,12 @@ matrix:`
`109`	`115`	`- lcov`
`110`	`116`	`- xvfb`
`111`	`117`	`before_script:`
	`118`	`+ - \|`
	`119`	`+ if [[ "$TRAVIS_PULL_REQUEST" != "false" ]]`
	`120`	`+ then`
	`121`	`+ echo "Don't run C coverage on pull requests."`
	`122`	`+ exit`
	`123`	`+ fi`
`112`	`124`	`- ./configure`
`113`	`125`	`script:`
`114`	`126`	`- xvfb-run make -j4 coverage-report`